I'm late to this party, but what a cool build! I sent you a PM about the CV axle cup clearance before I realized your plate cleared it. sorry.
What EVMetro is saying about the vacuum pump... pretty spot on. I drove my diesel metro to the exhaust shop last weekend and it was a bear to get whoa'd on down (that's a technical term in Texas). I bought a Hella UP28 vacuum pump on eBay and I'm going to plumb it in to a 2" piece of PVC pipe capped on both ends (a reservoir, if you don't mind the shadetreeness of it) and I also picked up a vacuum switch on eBay for 15 bucks.
The Hella 28 is not designed to be a full time vacuum pump for braking, but is supposed to "assist". It was way cheaper than the Hella UP30 and UP32 that are designed for full time use.
I will share my results.
P.S. wanna race when we are done? lol. endurance race, ok. You'd kill me in acceleration and top speed...
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