start with arranging your pedals on the floor, and measure roughly the length and width of it.. for the tampines ikea, they dont have the lumber yard, but they have this FIVE DOLLAR shelf thing, that looks EXACTLY like a pedalboard. seriously. when i post pics of the finished product, you'll see why.
or if you can head to the OTHER ikea, you can ask for a custom size piece of wood, or two pieces, i.e if your "board" measures 70cm X 30cm, you could try getting two pieces of wood that are 35x15 that kinda thing, and ask for the wooden bits to join them together.
imho, your imagination is the limit as to how you want your pedalboard to look like. even with the handles and the "wire-neatening-solution" i bought, total cost was like 20 only. including the wood. The only draw back is that you dont have a case. but that can be bought on ebay, with those ata flight cases that cost around 80 usd that kinda thing.
so it really helps to have a rough idea, or picture in your mind, how your final product will look like.
I guess the only tools you'll need are nails, screws, a drill, some lacquer(for cosmetic purposes), some carpet or 'VELCRO" brand industrial strength velcro, and handles (if you'd like), and a pencil to mark out drill-spots.