Today, I opened up the whole firewall, ripping out all of the remnants of the S10 firewall. I'll build a trough under a cowl to house the wipers and motor. A flat firewall will separate the trough from the engine compartment
I've been trying to fit this piece into the existing firewall for about a month now. It finally looks like it's going to work.
It looks like crap.
The driver's side of the S10 firewall extends two inches further into the engine compartment than does the passenger side. The S10 mounting plate for the brake master cylinder is canted about 5 degrees from vertical. I have no confidence that I'll be able to get the S10 A/C fan to work.
Tomorrow, the last remnants of the S10 firewall get cut out with the plasma cutter.
Had to rework the channel for the wiper pivots as I messed up the first attempt. The second attempt uses a shallower channel that is easier to bend and relief cuts only in the top of the channel.
I thought the wiper arms would be easier to work with if they were outside of the weatherproof cab, so I have started the interior firewall. I think the car will have two firewalls: one to enclose the cab and a second to hide the brake master cylinder and A/C box.