If you ever wondered why the vast majority of ultra large format photographers make contact prints, here's the answer. Maybe if you lived in a converted church or had a custom made, two-storey shed with a six-inch concrete base you'd get away with it. For the rest of us, forget it!
The machine above does up to 11x14 but even 10x8 enlargers are monsters. Your 5x4 floor-mounted De Vere would look pretty puny by comparison.
Thanks to David M. for emailing me the advert above. It's from the back cover of the current View Camera magazine. David reckons a Leitz Focomat for 35mm would fit in the bellows.
If you click on the jpeg, you'll see the various features of the enlarger such as motorised negative stage, focusing and baseboard. Durst also say they will build one for negatives up to 20x24". One can only imagine - but David M. would probably fit in the bellows...