Do you mean so you would turn it into something like this?
https://www.zoostore.de/Mouse-and-ha...nd-7-mm-wiring
If so then i think that would be ok.
Or, if it was going to cost you £100 to build a diy cage, would it be cheaper for you to look at the cages that are around the 100cm x 50cm - i.e. savic plaza, barney, alexander etc - which are all under £100 - or where you wanting to go bigger?