I think you'll find many of us have wooden cameras far older then you or me
Wooden cameras can also be fixed by almost anybody that knows the sharp end of a chisel. If the camera isn't abused a wooden camera will last a long long time.
On processing I think it'll depend on your local area. But processing 4x5 b&w on your own doesn't need to be anymore complicated then processing 120 or 35mm. Some of the Jobo tanks can actually handle all three formats at once if you use the right reels. Used Jobo gear isn't too expensive. At least when compared to getting somebody else to do your sheet film.
On the issue of cost. LF tends to be the cheapest in terms of bang per buck. Something like a B&J press camera with an okay lens will produce negatives only limited by you. Spending more money gets you a nicer more flexible camera but in the end if the camera can hold your lens and film holder then it'll take the same pictures a high $$ new camera will.
Buy something cheap but sold. An Ansco woodie is a good place to start. If you don't like it the resale won't be much different then the purchase price.