Couple years back I was building a race car on a mate's farm, nothing but a dirt-floored shed with a corrugated roof and power that kept tripping whenever I ran the compressor and grinder at the same time. You'd think that would kill the project but it taught me most of what I know about working with zero infrastructure.
The big one: plan your build order around your space, not around what the manual says. Fiberglass and resin work needs warm, dry air, so I did all my bodywork in summer and saved the mechanical stuff for winter when the shed turned into a fridge. Sounds obvious, but I watched guys order parts as they thougth of them and end up with gear they couldn't touch for months.
Second tip, buy tires last. Not second-to-last, last. Slicks have shelf lives and I've seen guys buy them early 'because they found a deal' then have them gone hard by the time the car rolls. Also measure your wheel arches against actual mounted tires before you commit to widths, not off specs on a screen. I got that wrong once and had to flare a fender by hand. Last thing, label everything. Every box, every bag of bolts, every loom. When you're three weeks into a wiring job and the light's fading you'll thank yourself.