The easiest way to do that is to make a master pattern out of a 3/4" substrate. It can be plywood, solid wood, or MDF. That pattern is your exact shape. Check your pattern if used many times, as the edge has to be smooth, no bumps, and no indenture from the router bearing.
Take your rectangles and use double sided tape, or hot glue to fix the rectangle to the pattern. The overhang on the edges should be within 1/4". So, your rough cut with the jig saw, or a band saw doesn't have to be that exact, but close.
If you use a hand held router, you can use a flush trim bit with the bearing on the top, and rout with the pattern on top. If you use a flush trim bit with the bearing on the bottom, the pattern is in the bottom.
I was thinking about putting a dowel rod/pin in the "template" so that the "rectangles" could be affixed to the template. The holes for the skateboard deck are already drilled prior to shaping.
Last night I continued again trying the jigsaw, belt sander, hand routing and came out 3/6 sucess. I do have a few questions though.
When using a router, is there a certain way you cant go with the router. For instance counter clockwise around the piece vs clockwise? I was noticing sometimes the layers would split and tear up. Not sure what was causing this. I did however come out with 3 beautiful decks.
BWSMITH, to answer your questions... My g.parents passed away and left me money to do something with. I have invested a large portion into this skateboarding manufacturing. I have no problems producing about 80 decks in 8 hours. It's just cutting them out and routing that I'm having difficulty with. Yes, that press has concrete, but it's also coated in a special coating to dampen the force. Also, it may look easy to build a deck, but you have to spend about 14k to buy the wood to do it. No place will sell you less than 1000 boards worth of wood. If they do, they will charge an arm and a leg.
I do have the oppurtunity to buy a wood shaper for 175$ but i'm not sure if thats worth it, or if I should continue doing it the way I made them last night?