I already built the stand using that "old stand". Finished Bennett's stand and the bug bit me, some spare ply and lots of spare time. I'll let you know if I need a hole saw, have one but the diamond grit seems iffy.
I have a drill guide that makes drilling holes less of a PITA if you want to borrow it you are welcome.
Still deciding on type of OF, internal 1 drain 1 return, custom OF box... or use a diamond wheel for the Dremell, cut a gap about 6" long 5/8" width, then cut an external glass OF box out of the 40B terrarium with a 1" drain; this second option I'd need a 5/8" bit for glass/tile for both ends of the OF gap.