When I built my van I had the same issue with apartments and noise....so I did this:
1. Most measurements I rounded up to square dimensions (straight cuts). This means I could get the cuts done at home depot or lowes for free when I bought the wood.
2. Bought cordless tools and did the remaining cuts in the van itself. Also bought a dewalt cordless vacuum to clean up after each cut.
3. Installed my solar in the parking lot of the apartment complex. The outdoor work was just putting on the roof rack. That's normal car stuff that most apartments don't have an issue with. Then attached the panels at like 5 in the morning before everyone was up. Used ratchets and quiet tools for that.
4. Bought a ladder that folded up small and was quiet when extending it.
5. Always kept the tools and the mess contained in the van as much as possible. Figured I would eventually have to learn how to do without the apartment for storage anyways so it was good training.
6. Found a couple of parks close by that didn't have many visitors...drove the van over there and did some work on early Sunday mornings.
All these things took longer but I never had an issue with complaints. Plus it taught me how to work with just the van. It required a lot of thinking it through and winging it but it worked. It also made me more aware of my surroundings as related to the van, how to be stealth etc.
Hope that helps