So you're not considering remediating this current house, so for example the pipes don't freeze during the winter, as I think I recall you mentioning? (When I bought my old house, I made a point to get ___all___ the "middle" plumbing redone, from suitable gas and water supply lines to existing terminal sewer line.)
First simplification I can think of for your decision is they are two general options, inwards (better house), outwards (make more soap or plastic or metal artifacts).
First improves quality of living at the cost of money, second has the possibility of making more money, giving you more options if things get dicey that way. Ah, would your current employer get upset if you started doing your own CNC work for hire?