Been away from the project for a little bit - but I got your DM- we can chat about it there.
Finally got back to a little bit of progress - Bit another bullet and decided to do a little exploratory deathwheel surgery to get a better perspective for the rear subframe mounting solution.
I chopped out the passenger bed wheel well and I think I will likely be widening the rear frame slightly to accomodate a stock subframe and subframe bushings (hooray, buying more parts... 😶) This will end up being a much cleaner solution to my problem and I think the creative use of some welded captive nuts and box tubing will yield pretty great results.
I kind of half-assedly leaned the new coilover through the wheel well cut after also chopping off the stock bumpstop - and I think the space will be tight but sufficient, especially since I'm planning on using the old Impreza wheel wells as a base for the new structure. There'll probably be some reinforcement of the stock bed sides too, but I'm gonna approach this as close to one problem at a time as possible.
Like i said - tight but doable. Everything is also just loosely stacked in place, and the rear end is jacked up about 8" higher than it probably would be so everything seems short at this perspective. I only need about another 1.5"- 2" of real estate to mount the forward bushings, and I think I have a pretty good idea how I'm going to get those in once I've got a new subframe to play with. If anyone has a '98 or thereabouts Impreza subframe handy with the bushings still intact (I botched the original by being hasty - see previous posts), reach out quick or I'm gonna get impatient and go to ebay for one 🤣
Gonna repeat the procedure on the other side of the bed, then it'll probably sit for a little while again while I locate a suitable subframe replacement.