As long as you can manage the kits, it´s basically OK.
Usually I use kits according German Industry Standards for powered vehicle kits (DIN 13164 or DIN 13167). The are cheap, have sufficient content for most usecases and usually have a five or ten year shelf life (2 to 3 for the adhesives). Sometimes the kits can be bought at about 5€. That´s when I pick mine up.