So you can buy a handful of the parts at any of the stations for big numbers, but I managed to make my ship by hunting down the golden buried tech. You get o one part for each module you have to break to mine them so you get a minimum of 3 and the loot it normally has which you can then flip for more parts.

Just to specify, that's the yellow wifi signal when you're using your visor. The ordinary and silver ones just give you the usual.