Hey everyone I just joined this forum, I recently purchased a Plaubel Peco Universal III 5x7 camera and soon realized how limited I am on film choices so I started looking for a 4x5 reducing back. I thought I found one and bought it on the German ebay site and got it just yesterday to realize it's not a 4x5 reducing back but a 9x12cm back, I am very bummed as I paid a good amount for it. I continued to search the site because it seems a lot easier to get things for the Plaubel in Germany, I was seeing things like this:

http://www.ebay.de/itm/Reduzieradapt...ht_2600wt_1145

and like this:

http://www.ebay.de/itm/PLAUBEL-BACK-...#ht_3025wt_942

and it seems to me that the ground glass could be mounted on the back adapter to effectively be able to shoot 4x5.

My stepdad also has a plasma-cam which is a device that can cut metal to different designs and was thinking if it would be possible to make a back and just mount the 4x5 ground glass to it...

any direction or advice is appreciated thanks