I need to scan 4x10 film and am hoping to use my Precision III scanner. I am thinking that I can use a 4x6 film holder (I could also get a longer custom holder if more overlap would be better), scan the film twice, once from each end and then stitch the scans in Photoshop. Is this workable? Am I missing anything? I thought I'd ask the hive mind before I start buying film holders.