For those with access to 4x5 enlargers, some of them are not that much larger than a 6x7 enlarger, in terms of the space it takes up. Measure them.
Example, my Omega C67-XL (6x7) has a 26x18 baseboard, and my Omega D5 (4x5) has a 28x18 baseboard. The width of the baseboards is identical, 18 inches. The D5 baseboard is only 2 inches deeper. Now the bulk of the head and column is much greater on the D5, but that is air space, not counter space. OK this is comparing an XL to a non XL chassis, but this is what I found and bought.