I bought the hardtail in eBay, it cost exactly... errrm... $15 XD
it looks good, but sure there are better bridges out there. However, it's very difficult to buy 'inexpensive' parts for a 7 string, I had to buy 2 complete hedstocks to get the extra tuner... anyway, you always can upgrade them later.
Yes, as I said at beginning, I started the project 2 months ago... sorry, I feel a bit 'insecure' in this forum, there are too much serious builders here.
I live in Almería, south of Spain... thanks for comments!