Timing! I found my brothers old Star Trek Fact Files the other day and scanned in a load of schematics at crazy high res, including ones for the Ent-C. I've got either the 3 seperate images (each about 10,000 x 10,000 and around 250 MB) or all 3 peiced together (at 26,781 x 11,681 and 375 MB) but the latter may have some errors around where I peiced the images together. I can, of course, scale them down to whatever size you'd prefer first.
If anyone else is interested in any of the other schematics, drop me a PM and I'll see what I can do.