After a first try with a patch antenna, the unit lost GPS lock every now and then, so I've ordered a dedicated GPS timing antenna (Quadrifilar-helix design to minimize multipath propagation interference).
With the new antenna I get a solid GPS lock, but the GPSDO is off by -440ppb, correcting about 150ppb within 3 minutes every 40-50 minutes, but drifting back to -440ppb thereafter. Not usable.

I purchased the assembled clock circuit board without the case as I wanted to install it into a Hammond Translucent Plastic Case ( the largest one fits perfectly ) so I could install power and GPS antenna connectors on the back ( the power and gps antenna connectors are mounted on the sides of the circuit board so their matching plugs exit the sides of the case nick provides ) and not have any screws heads protruding from the front of the case. I purchased black m3x10mm screws to replace the silver screws that come with the case so they would not be noticeable. Since the screw heads are countersunk into the case front and are farther away from the clock display than those surface mounted heads on the case nick provides, they are not as noticeable and for me make the case and display seem cleaner.
Understand, I’m not bashing or disparaging the case nick sells. It’s considerably smaller than the Hammond case, has AM and PM markings on the front and is considerably less expensive than the Hammond case itself not even including all of the associated hardware, plugs and connectors I needed to complete the installation. It just didn’t fit my aesthetic sensibilities.
Because the Hammond case wouldn’t have the AM and PM markings engraved on the case as does the case Nick provides, I decided to replace the Red PM LED with an orange one. I contacted Nick who replied that he would assemble the circuit board but not install the AM & PM LEDs but would include them so I could install whatever LEDs that looked best.
Nick promptly assembled and shipped my clock. After trying a number of different led color combinations and viewing them through the Hammond Red Case so I would know exactly how they would look I chose a Red LED for AM and an orange ( Amber ) LED for PM.
I purchased a back for the case nick sells from nick to use as a drilling guide for the mounting screws for the circuit board and using it drilled the four mounting holes and the two holes for the setting switches into the back of the case. Nick even offered to refund the cost of the back after I used it to drill the holes if I returned it to him undamaged !!.
I then drilled an 8mm hole for the 1.5x5.5mm power socket in the back of the case below the circuit board and soldered a matching right angle power plug cable to the socket since both the power and gps sockets on the circuit board are mounted on the sides.
I drilled a 1/4” hole in the case back for a 4” right angle SMA male to a right angle sma female bulkhead Cable I got on eBay and mounted the bulkhead connector into the case.
I mounted a 4-40 x 1-1/2” threaded standoff/spacer into each of the 4 holes I drilled into the case back. I then plugged in the right angle power plug cable I attached to the matching jack I installed in the case back and the male right angle sma connector on the 4” cable which is attached to the female right angle sma bulkhead connector also mounted to the case back
( because of limited clearance the connectors need to be mounted to the circuit board before it is attached to the standoffs/spacers ).
I then attached the circuit board to the spacers, attached the front of the case to the case body and attached the active gps antenna and the power supply I got from nick to the power jack and female sma jacks I installed on the case back.
The clock started right up and synced the time to the gps satellites within a minute.
The clock looks and works great and Nick was great to work with.

Very useful to find a power module that does not require any extra components. Easy to assemble, but could use a few more photos/instructions especially a side view of the triacs, as I mounted mine a little lower than optimal for best heatsink contact.

Thermal paste and standoffs are recommended.

Beginner friendly, I only had to review resistor identification.

Mounting holes are a bit small for M3 screws, but they fit without problems.

Great hackable PID controller (type ii), requires ftdi cable.

Fits into a standard 16*2 LCD display holder that I got separately, it's also easy to find 3d printable enclosures.

Could use a few more photos/reference diagrams of the board.

Very responsive to emails and inquiries.

I purchased the complete 24 hr mechanism, set for Sidereal time, in order to make a sidereal wall clock. Unfortunately there are limited options for a 24 clock face, so I ended up buying a 24 hr clock and replacing the mechanism and hands. The movement keeps perfect sidereal time! Great conversation starter about the difference between solar and sidereal time, and an easy way to know what will be overhead at night (no need for a planisphere, just a sky chart with right ascension).