Helipad Construction Query

[Cobra]

Hey Guys, i was looking through some of my Stuff and Found a Helix 360 Protractor and was Wondering if it could used to Make a Helipad using Sheet Styrene like Evergreen & Plastruct offer. I'm thinking about doing a 'Gerry Anderson' style dio with some Helijets and Thought i'd Make the Pads rather than spend Money on them. What Say You?? Thanks for Looking. Dan