+1,000000000
Wrong size - the Lisa CRT is 12".
My vote would be for a 12"-14" high-resolution LCD (or a good colour multi-scan CRT) and modern guts, running a Lisa emulator. CD/DVD drive in the floppy slot, of course
/edit/ - just noticed the floppy is 3.5", not 5.25". Much better would be a slot-loading optical drive behind one of the ventilation slots at the right. Looking at the back, it looks as though you might be able to have 3 PCI slots without too much horror, too. For a real challenge, install new hardware without altering the Lisa case in any way, so it is still in original condition, should you decide to fully restore it or sell it later.
Or - retr0brite it and sell it on eBay to someone wanting a nice clean case for theirs.