Hey does anyone know any board games where you can design your own spaceship and battle with them?
Traveler is a sci-fi DnD style game with the most recent iteration of it by Mongoose Publishing having pretty indepth and intense ship design/combat
http://www.mongoosepublishing.com/rpgs/traveller/core-rulebooks-accessories/traveller-core-rulebook-722.html
Warhammer 40k rpg Rogue Trader also has some ship design/space combat in it.
Well, if you're going for roleplaying games, then
Stars Without Number is an even more D&D-like version of Traveller (specifically
Basic D&D). From what I know of Traveller, the rules are a bit less in-depth (there's only one type of drive, the spike drive, which goes from levels 1-6, and instead of powerplants, power is determined by the hull type), but there's certainly an element of ship-building there. And the PDF is free, so you can check out and use the whole base game without having to pay anything.
If you want to compare it to Mongoose Traveller, that has an
online SRD, which will show basic elements of the rules without the fluff or book-style organization. Also, here's link to the American version of the Traveller core rules in you're from here or the conversion rate would work out better for you (doing an online conversion, it would cost $6 more for me to order from the British version of the site). It doesn't have an ebook version available like the British version of the site does, but the price for that is beyond what I'd pay for a digital format anyway.
Looking it up on
DriveThruRPG, the PDF price is a bit better there, and it's very much discounted if you buy it with a book. Since it's on DriveThruRPG, the book version is almost certainly Print-On-Demand, just so you know. I've gotten books from the site in the past, and I'd say they're very good quality, but I've only ordered small black-and-white softcover books so far, so I can't give a fair assessment of larger or different types of bindings or how colors work out, other than for the covers, which are a very nice full-color printing. Although it seems the DriveThruRPG version of the book is in B&W anyway. Not sure if the officially printing is different.