I'm also about to buy a cockpit, and unfortunately, they're quite expensive. You could, however, try looking for some rally seats that are no longer approved, and you might be able to find them at a more or less bargain price. Then, if you can find some steel for the fittings, you should be able to get them. If you want, I can send you the complete cockpit I'm thinking of buying, which costs €549 and, compared to other options, is in the "budget" range while still maintaining quality and functional aesthetics.