- You can stitch it together in Photoshop as you currently do (a pain, but it works).
- You can get a larger scanner, expensive but works (up to a certain size).
- You can get some good studio lighting and photograph the work (works, though it takes some lighting knowledge).
If you're short on cash, stitching it is going to be "best". If you can afford a big enough scanner, that'll be "best". If your work tends to vary in size frequently and/or is often very large, photography would then be "best".
Also, if you don't mind the trip you could go to a professional print store (e.g. Kinkos, or a local shop) and see if they do digital scans. They ought to have the equipment for use at a modest fee.
Hi, before you buy a larger scanner, you might want to try the following:
Try PHOTOMERGE in photoshop application, i think in versions CS3 or higher.
Basically is an option designed to merge several photo or scans almost automatically. altough i have yet to try that option i have heard and seen that its very helpful and highly recommended, specially to merge several and complicated photos into one file.
That option is located in: File/Automate/Photomerge
Give it a try and tell us how it worked.
I am in a similar situation, scanning larger sheet of paper in a cheap smaller scan.
Hopefully it will save you some money if you already have photoshop. Good luck!