Welcome to the world of iceboating. First of all if you are just starting to build an iceboat for this season, you are already way too late.
What you should do is buy one that is already built. There are several reasons for this. First the hardware to build an iceboat is relatively expensive compared to the cost of a used boat, second it takes quite a while to build a quality iceboat. I would figure on around 100-300 hours of time to build a boat and plank well, get everything aligned, sharpened etc.
Secondly, your best bet is the DN iceboat. Parts are available, used boats are available and there are lots of racing and cruising oportunitys. You can expect the DN North Americans to draw 120+ boats and the worlds in Europe has to be capped at 200 boats. Lots of competition.
As far as building or buying, your first iceboat should be bought used. I would argue that you don’t know what you want yet in an iceboat and you should not build one until you sail a batch of them and decide what you like.

Enough with the gloom and doom. Iceboating is so much fun it is unreal. A good day on the ice is better then any other day of sailing. There is absoulutely nothing like rounding a windward mark at 35 mph and accelerating up to 60 as you peel off downwind. One good ride on a DN and you are hooked.

Sail fast, sail hard water
Eric Anderson
DN US 5193