Originally Posted by
wroomwroomoops
Hey, I need to do something similar: need advice on best way to do straight cuts.
Plenty of those around. You can use a hose / jubilee clamp. You can take a fairly non-stretchy tape and wrap it a couple of turns. If you get it to align edge-to-edge it'll be a straight line.
Or you can buy one of those purpose made saw guides. Or a dirt cheap miter box from any DIY store.