As of recently I've rediscovered the joys of scratchbuilding stuff, both by successful first tests in 3d printed components and a considerable slimness in the wallet department that prevents me from buying awesome resin goodness.
So, following this second renaissance, I've started building a Valdor Tank hunter, not sure as of yet, if it goes for the renegades or loyalist forces.
The first stage is the gathering and compiling of information, like papercraft templates and a LOT of reference pictures. Usually there are unboxing pictures of these models and these usually show the different parts disassembled.
Try to get reference dimensions, work by using dimensions you already know and try to extrapolate the rest by comparing those to dimensions you know. For example, I've measured the hull of the tank based on the sides of the tank, since those dimensions were on the templates. I kinda just went from there and extrapolated the rest myself.
The printer I used for this is a typical FDM home printer, the leapfrog creatr and all parts were printed in PLA.