We did similar project in the beginning of century. Here are few things that I recall.
CIS vs CCD sensors - we did one based on CIS sensors (google it) in Canon Lide, one big advantage of it - it is wide and cover 8in area and covers 8x10 nicely. Another - simplicity, powered by USB and lightweight - even usable in the field, 3rd price - ~$80, we wasted about 3 scanners. You will need to take it apart pop wide micro lens at top of CIS. One disadvantage of Canon Lide was that CIS was mounted about 2mm bellow assembly surface - somehow limiting with very wide lenses. There were a lot of similar projects at time - google canon lide camera.
By using short CCD on 8x10 you're pretty much wasting real estate
Software - your best bet is Sane:
http://www.sane-project.org/
You'll need generic unix understanding, also it runs on modern MAC's. Full open source code drivers for a lot of scanners . At time we're been doing it there was no Lide driver and we had to piece one together from other drivers, I should still have source for it somewhere. But I'm sure Lide is very well supported now.
Besides basic servo motor/CIS control/exposure timing we had to deal with color regeneration and stripes. Later I've seen someone did similar and published reasonable article - google for it.
That was 8x10, nowdays I see 4x5 CIS scanners aka:
http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT
Can make very portable back.
If you want to stick with CCD, again Sane will give you access to software, you'll need to find scanner with large Kidak linear sensors, here are specs:
http://www.kodak.com/global/en/busin...ar/index.jhtml
here's pic of sensor in my PhaseOne scanning back:
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