Reviewed drawing spreadsheet showing questions and associated drawings. Worked to detail list of questions to discuss with Van's builder support. Discussed the following with Van's builder support:

DWG 24 six rivets on each side for F-902 to F-7105B. Suggested solid rivets where possible. Suggested Cherry Max structural rivets in other places. Additional research found posts on vansairforce by Van's employees saying CR3213-4-x (-2 in my case) were used in some key places on Van's kits because they had higher shear strength. I'll try to squeeze the ones I can reach and use Cherry rivets in the other locations. Added Cherry Max rivets to my aircraft spruce cart.

Space needed above PC680 to remove battery. No guidance so I will be conservative and not place anything above the battery so it can be raised up to the flange on the firewall if needed. Instead of using the electrical feedthrough location above the battery suggested by Brian, I'll move the feedthroughs closer to the engine mount bolt by the brake fluid reservoir.

Engine and battery ground point. OP 27R2, OP 30 and OP 31 all show different options. It looks like sometimes the grounds could be common and other times separate. Since I used pro seal on the firewall recess and primer on the other firewall parts, I will use a common bolt for the engine and battery ground connection. And also run a wire from that location to the Avionics ground bus near the panel.

Nose gear access hole. DWG 19 R4 and R5 and some versions of OP 33 R1 stated a hole was needed for some of the engines, but didn't list the IO-360-M1B. The person I talked to at builder support wasn't familiar with the hole and guessed I was reading the drawing correctly. So I wasn't going to add the hole even though the hole plug is included in my FWF kit. After the call I completed additional research on vansairforce and found a note about using DWG 46A. Rev 2 shows use of a 1" diameter hole and R3 shows a 3/4" hole. Inspection of my engine mount made it obvious to me that I needed to add a hole. I'll use 3/4" and increase to 1" if it appears to be a problem when I install the engine mount.

Throttle, mixture, alternate air and cabin heat cable hole in stiffener. DWG 19 R4 and R5 and OP 26. Builder support didn't seem very familiar with the drawing or if they applied to IO-360-M1B or just to IO-360 vertical induction. Builder support did suggest looking at OP 22 which I had seen before, but forgotten about. I think it does work for my engine and the mixture and throttle parts included in my FWF parts order. Builder support did agree with my choice of DWG 19 F for mixture, A for throttle, and L for alt air, but that didn't give me a lot of confidence.

Discussed what I found out from builder support with Ellicia. She suggested finding someone that built using my configuration and ask them. I then remembered I had pictures from an RV-7, IO-360-M1B build that Deene had showed me. I looked back at the pictures and found they helped me confirm answers to most of my questions. And finding DWG46A helped answer a lot more.

Looked at McFarlane drawings, but didn't settle on what controls to use for cabin heat valve, throttle, mixture, and alt air.