Are you telling me that in LA there are no Do-it-yourself / hardware stores where you can buy tools (hammers, chisels, saws) and materials(wooden planks, beams/timber, and the likes) when required? I don't really believe there are none of those.
Heck, you could even get the required materials at the IKEA if you take your time
You're not dependent on anything growing outside or whatever.
Edit: looked up on Google maps, and there are several hardware stores in LA that have everything you need.
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