For this effort you will need an old mac plus or other old mac
Stuff you will need:
New Small Tablet
Packaging that came with the tablet or some junk cardboard
Power supply for small tablet
Step 1 - open up the mac and remove all the components - you may find it useful to save the screws. You can find instructions for this on youtube: https://www.youtube.com/watch?v=qKcQp88ya_0 .
Step 2 - open up the packaging that came with your tablet
Step 3 - carve up the pieces of your packaging that kept your tablet snug and reposition them into your mac plus. The Dell Venue 8 packaging fits pretty much perfectly snug inside the casing for the plus.
Step 4 - put the pieces together
Step 5 - fire it up and enjoy! Bluetooth keyboards and mouses are probably a good idea.
I've got a lot of great photos that show the process.