Skander, any chance of more information about building your 4 x 5 enlarger? Is this a build from square one or have you adapted an old camera?
I have always felt the problem with moving up to 4 x 5 was having to buy an enlarger as well as the camera. Somehow the idea of building a 4 x 5 enlarger seems less daunting than building the camera itself.
(Newcastle upon Tyne, England)