I just picked up two Durst Laborator 1000 enlargers. Both came with a Pavelle 401 color head, timers, fan, and a bunch of Nikor and Schneider lenses and 6 carriers plus spare parts. They are both set up as wall mount, but luckily came with the bracket to mount on a table, but no table so I have to make one for it. So here are my questions. What is a good size base board to make for this enlarger? I was thinking 24" x 24" Any issues with using the 6x7 carries with 6x7 if I mask it at the head? It came with two 80mm lenses, a Nippon-Kogaku EL-NIKOR 80/5.6 and a Schneider Componon 80/5.6, Which lens do you think would be better for B/W? I hear you can adjust the mixing at the head to mimic contrast filters, is this correct?