I get a lot of questions about profiling the wooden core so the tip and tail is nice and thin while the middle is strong and thick. Usually you can go to a local carpenter shop with a cnc machine and thy can do it for you. If you like doing it your self as most of us, you will need a router, or a wide planer!. Using a router you need to build some kind of a jig to profile your core. A jig purpose would be
1) to hold the core secured while you are profiling it with the router,
2) to make the right profile on the wood, thin tips and tail and the desired thickness in the middle.
You can easily use mdf as the base. If you decide to use a vacuum cleaner as the sucktion device you can rout channels in the mdf and connect the wacuum cleaner or a vacuum pump to it. this however need some testing and working on. A simpler solution is to hold the core down with clamps.
Also the base needs to have some ramps on each side to make sure that your routed core has the correct thickness in the end. The remps would serve as giudes for the router, which can be placed on a piece of mdf or plywood, securely, with the hole in the middle for the router bit to go thru. The whole setup would slide on the ramps and route the wooden core underneath to the desired thickness.,,
Also if you would like some CNC machining to be done, vising few local carpenters. Many of them have CNC machines and can cut the core to your shape for like 50 euros.
Profiling your wood core might be needed if you are building a kiteboards or skis or a snowboard, so you might wish to build a setup where you can put down your core and run over it with a router, so you can get thin tips/tails and thick middle. Se here as an example, https://www.youtube.com/watch?v=ue-seCVszPo
Se this video for inspiration,