My only comment is 3/4 melamine is not very stiff and will not stay flat. ou need to stiffen it somehow.

I used h/d kitchen work top supported every 3 feet. 12 feet long. To actually build on I had some fibre board which I could push pins into.

As I was sensitised to epoxy and cyano I had an extractor fan with a flexible hose extension which I could use to positively ventilate any fumes from the area I was working on.