Patrick...suggestion: Portable work surface so you can adapt to larger projects without "permanently" taking up space that could otherwise be used for large assembly, etc. Simple torsion boxes that are flat combined with alternative hight options maintain maximum flexibility and also allow less back strain during assembly processes because you can work at the "right height" for whatever you're doing. A lot of that kind of thing doesn't require a heavy, permanent bench...and you already have one of those monsters for when you do!
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The most expensive tool is the one you buy "cheaply" and often...