Hi Harrygary
welcome to the most informative site on the net. I have tried to use pallets with some poor results, the wood tends to split and there is always a knot where you don't need it! I also tried red and white deal, again a lot of knots. If you are using ply, try to get birch ply, ordinary ply has gaps in the layers, and you will find them again where you don't need it! I find MDF ok for practice but the dust is horrible,(and dangerous) so buy a good quality, mask the standard dust masks you get in hardwares are not up to the job. I live near a joinery works and they let me have some off cuts really cheap, if there is one near you it might be worth having a chat with the manager. I find it good because I can try different types of wood. Hope you enjoy scrolling!!!
Regards
Brendan
If a hammer doesn't fix it, you need to hit it harder