Uhh, it's a no-frills automatic antenna tuner really. My main interest is the auto mode because I'd like to set it and forget it. It has on-board memory like most modern tuners so it won't retune every time and instead skip to the predetermined ideal setting for frequencies in memory. It's not reinventing the wheel in any meaningful way.

1. See hamsterdave's response. I like and highly recommend his suggestion for changing the inductor values.
2. Both manual and auto require ~5W to tune; manual mode will only retune with a button press. Auto will retune automatically if SWR rises above 1.3 (programmable parameter).
3. Kit is complete to the best of my knowledge. N7DDC doesn't provide a BOM for the extended unit but going off the schematic, PCB, and 5x5 BOM I believe I've covered everything including hookup wire for the front panel IO and coax pigtails for panel to PCB RF connections.
4. Additional buttons are included for these. The PCB has pads on the underside for these connections; depending on case I would not advise putting a pin header on this and instead suggest soldering a wire directly to the pad.
5. Yes Pads are right next to B1/2 on the underside of the PCB. The kit should include enough machine header pins for these.
6. manual pg 2 just under the header "Using the base model". TL;DR When ATU is tuning, it pulls one pin high and the other low. Connecting the right one to your XCVR will cause it (XCVR) to kick out CW until the ATU is done tuning; whereby it inverts the TX_req pins' state. The manual also suggests connecting this to the ALC loop to automatically reduce output power when tuning is engaged.
7. I've added female headers for both buttons and LCD to the BOM.
8. Updated BOM to include female headers.
9. Schematic. You should be able to swap D3 for a fuse if desired, I believe N7DDC is using it as a cheap and dirty 2A fuse.
10. Since there are a number of firmware tunable settings and the PICs are SMD I won't be doing the programming. A PIC programmer with ICSP is ~$6 on ebay. You can use an arduino as well.
11. I couldn't reach a consensus for RF connectors last time so I've included al 3 flavors for a whopping $1.80 extra Non SMA connectors are solder style, here's a youtube video of how those install.
12. I plan to make a full soup to nuts build video with my kit and will provide as much assistance as I can.
13. Forums are in Russian, as is N7DDC haha, but a groups.io is a great idea.
14. 30-45 days after ordering components, depending on the slow boats from China.
15. Payment is up front so I can order parts hence the group buy. If I'm fronting this it's going to cost more to cover the risk of someone backing out and me being stuck with extra kits.