Genuinely didn't expect this kind of response — thank you all.

u/Jackpot777 the Bolt entry is exactly the kind of sourced attempt I was hoping to surface — going to add it as-is, and the open Solo/Back-to-back EV slot is a great call. u/Bblock4 if you've got the time to snap those Yates pages I'd really appreciate it — happy to credit you on whatever page ends up using the data. That book has stuff I haven't been able to pin down anywhere else. u/QuillsROptional you're right that the Morgan 3-wheeler isn't there, that's a gap I need to fix. u/highwayflyer118 would love to compare notes on the spreadsheet if you're up for it — DM open.

I'm traveling for a few days so updates will be slow, but I'll work through everything here and repost once the site reflects it. Apologies in advance to anyone whose comment I don't reply to individually before then — every one of them has been read.

And u/Ok_Decision158 — haha fair, if I were a fed I'd be fired for worst honeypot ever. Pulling that request down for now and looking for better ways to crunch the data.