Did you manage to tighten down the hoses alright? I don't think I nipped mine up properly. When I went to tighten down the nut on the fixed line the flexible hose would rotate within the chassis mounting. Think I need to shim the hose within the mounting.
I replaced the plywood on the passenger side on my other car a few years ago. It was rotten. Look up project 3193 I think it was post from around 2008 or 2009 . Ended up making my own board. Just used a router and a wood saw and some pva glue. Was quite pleased with the result. I did post pictures of the construction. Used the old one as a template. From memory it was 1/2inch ply. Good luck.