Just thought I'd chime in on here on a few points:
Saw agrabau's BMW run at a Devens autocross (think it was last year?). Car sounded badass, but too bad it didn't pass noise level
I personally liked the tow- setup more :P
As for camber: it'll depend a lot on how low/ stiff your car is. With the 9kg springs up front and whitelines on full stiff I was at about 4.5deg running the 275 Hoosiers. Same spring setup and slightly lower I was at just under 3 (going from memory) running 245 Victoracers. More grip = more roll = more camber, I guess (a lot of my setup was based on heat distribution).
As for tire, 225 RA-1's are definitely undersized for anything over stock (or bolt ons) power, IMO. Given, I have limited experience on RA-1's... but running low to mid boost on my old setup (good for around 200-220hp) with the 245's, I felt very limited. Halo ran a 225/ 245 RA-1 setup for a few (i think) autocross seasons and I'm pretty sure he wasn't too impressed with them (always had the "you've got the better tire setup" card when visiting NER :P).
As for tires on a 7.5" wheel: they'll fit fine, especially if they have some sidewall. I ran 245/45/R16's on z32 wheels for a long time before upgrading. A lot of stock class autocross cars will run an oversized tire as well. I might be running 275's on an 18x8 for instance (racing my daily driver while rebuilding my s14 this year).
As for suspension: Koni 28-series all the way :P Might go with revalved Yellows for my daily driver if I do Solo II Nationals with it (have an urge to invade the "pony car class" with my G) but looking at running a full race setup on my s14, although that'll be a trailered car. If you're going to be driving to/ from events, though, I'd bet a Ground-Control/ Koni Yellow (revalved/shortened or not) would be your best bet.
Finally, I like the theme of your interior, but for a full race car I would've done a cluster on the steering column. You don't need a speedo/ stock temp & fuel gauge for a race setup (well, fuel might be nice to know, but as long as you can see it at all even if not at a glance). I'm also hoping you're doing a full roll cage with side intrusion bars... especially if you're gutting the doors...
Anyways, nice build up and updates! Hope you get everything sorted out, regardless of flames and what not.