Replying to P tex cutting help!

I guess this could go in gear talk but I thought i would get a wider response in this forum. I am making skis with a friend of mine who has made skis in the past. as he is in hawaii for vacation now he told me that I could cut my bases and attach the edges. I already have my exact computer generated sidecut profile traced onto my base and have done a rough cut about 2mm out form the final cut.

The question is what would be the best tool for cutting my ptex accurately yet also at a 90 degree angle so that my edges will fit seamlessly together with the base, thanks

ps if there is another forum to put this in that would be more helpful please tell me.