I'm sure there's a simple way, that needs to be 1:1 scale with the real life equivalent in the end. How could I go about scaling it?

All I can think of is figuring out how wide/tall it is now and doing the math to get how much to scale it up, but it's at a random size right now cause of the blueprints. Also, don't trust myself to do that properly... Either that or set up a measure tool to the length it needs to be and then scale it up till it matches, also wouldn't be accurate though.

Halps?