You're not building on glass? Oh dear!
These days I don't really build off plans (having experienced interesting variations in dimensions as a draftsman, caused by out of whack printers) I just Blu Tack the plan to my workshop wall, and take reference dimensions ofd that, and work out what needs to go where, either on the glass, or on the sheets of wood themselves. masking tape on the glass makes for easily removeable stips to draw on, and when you're done just scrape the glass, (including all the gobs of CA, epoxy and other snot) and clean down with actone or a similar solvent, and it's ready to go for the next round.
If you have an automotive or marine glass shop nearby, ask if they have any incorrectly shaped TSG (toughened safety glass). Once it's tempered it can't be reshaped and is a throw away item. I got a pane out of a bus that was for free and it's 4'x3'. more than big enough for most work.