I've been cutting the 15 mm ply for this build this afternoon. Originally I had an aesthetic design, as in the picture below, buuuuttttt the reality of my limited tools and work space made me realise I needed to simplify the design by way of simplifying the kinds of cuts I'm going to use.
I've modified the top left, light blue cross member in this design, so it's just square cuts and I'll do this for all the pieces. What I can do later on is then come back and add in the angles if I want.
This grates on my ocd design sensibility like you wouldn't believe lol
Here's another view
See this page for a youtube video on which the design is based