Thats what Orange have been doing since 1988 lolBuilding a pushbike from scratch isn't so hard, a few tubes, a hacksaw, a jig, and a welding torch is about all that's needed.
According to my German engineer cousin Klaus (and it seems confirmed on a couple of German e-bike forums), LIQ bikes – or at least the LIQROCK the OP bought - is actually both made and assembled in Germany by FOCUS, so it can’t be all bad. At least the frame is genuine TIG*, rather than a TIT* as R&M appear to be.I get the impression the German bike trade is a bit like ours used to be - quite a few shops have their own brands.
Building a pushbike from scratch isn't so hard, a few tubes, a hacksaw, a jig, and a welding torch is about all that's needed.
An ebike frame could even be simpler as the bottom bracket is more straightforward.
This bike is 'budget' inasmuch as any Bosch bike is, so at the original asking price the seller will have been getting most of his money back.