thanks for the ideas everyone, but for now ive found an extra cage that i had for previous hamsters. i totally forgot about it! it was a dwarf hamster cage with holes for tubing, i took everything out of it (the smaller dwarf things) so it was completely empty. it took a while but i managed to add it on
there is way more floor space and part of the top is wire so Pumba is happy
ive put in a few toys etc for him
i will take a pic later and post Pumba's home