All suitcases are different, so you're going to have to estimate quantities for materials based on the suitcase you select. Don't go crazy with size on the suitcase. Stick with a case that can fit in a carry-on bin.
Supplies and tools:
--a wooden-sided suitcase, I found mine at a church rummage sale, I stripped out the existing lining as it was moldy and full of pockets and things. Alternatively you might build your own wooden suitcase using seamster's instructable
--wood for shelves, I used 1X4 oak boards I found in a dumpster
--finish for the wood, I used Rosewood-colored One-Step Wood-sheen Minwax stain and finish that a friend was going to throw out
--a hand saw and miter box
--sand paper, although a power sander or Dremel tool will save you a lot of grief!
--rags for applying finish, and something to protect the surrounding area from stain
--material for lining the case, I used leather I bought from a shoe repairman and some navy corduroy fabric
--a rotary cutter, sharp exacto knife and ruler, or heavy duty scissors capable of cutting fabric and leather
--leather or similar for making additional "washers"
--some cardboard for lining the case
--liquid nails or silicone caulk and a caulk gun (at least two tubes)
--hinges to reinforce the case, holding books means the case needs to be able to carry more weight
--at least two simple draw latches, don't want the case bursting open in travel! My case had two quite strong latches at the front, you may need additional latches depending on the design of your case.
--two barrel bolts for the shelf extension, this is something that could do with improving. Another type of latch might be better. Please comment with any experiments you might have!
--a drill and screwdriver
--screws (oval head) and washers (cup-type) for screwing in the shelves, I think I used size 8/32 diameter screws about 3/4 or 1 inch long. If you are attaching a bookplate, you will want similar washers and very short screws.
--a small easel (optional), I was able to fit a small easel between the shelves when packing the case. This let's you display a larger book once you've unpacked.
--(optional) some thin plastic and a book plate so you can let people know whose case it is! You will also need washers and short screws for fastening.