A gorgeous piece of work. I understand making do with what is handy so not really a criticism but I would try to have the grain run with the wood and not use MDF for very much (though I may be in a minority on that point) I have discovered that unless totally sealed it returns to its original sawdust way too quickly,
Also, I run this for each new material and keep it as a reference set of what works and what doesn’t, and what settings will burn it or not.