I've built multiple DIY cages, including a Billy cage and a Lack cage. I built my Lack out of the midsized Lack coffee table. I stacked two Lack tables on top of each other and added acrylic sides (with only aquarium sealant), a substrate barrier, & a track & acrylic doors, but from what it sounds like, you want to flip yours upside down & add sides, like a tank...correct? I'd love to help & answer any questions that you have...if any!
My hams no longer live in either of these cages...I wanted one enclosure that housed them both, so now they live in the DIY hack below:
