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You didn't say how far you jumped in, but I think this decision should take a lot of consideration. I've build one frame and fork, a fillet brazed track frame, and a second bike, which is a lugged 853/OX Platinum ss mtb is on the drawing board to hopefully be started in the next couple of weeks.

Point #1. It's expensive. Tools. Flux. Brazing Rod. Dropouts. Cable guides. And that's all before you realize that a good tubset ie 853 or foco/ultra foco/ox platinum costs about $30-$40 a tube.

Point #2. It's time intensive. The first one took about 10 weeks start to finish, averaging about 8 hours of shop time a week.

Point #3. You probably won't get it right the first time. This is especially true with fillet brazing. Finishing fillets is hard, even if you've had metal work experience.

Now, if you do a hottubes class or something, that's a good way to start, as at least you'll be getting good advise, and a hand. Trying to make a first frame on your own would be difficult at best, and dangerous at worst. Just don't go into it thinking that you'll be better than a pro builder. Every person who picks up a set of tubes or lugs thinks they can be Richard Sachs, in about five minutes, I sure did. If you have expectations like that you will be dissapointed.

For tube selection, you'll probably want to try and source a supplier first, which is challenging if you're not a pro builder, as some companies won't sell to you. When you get their catalogue, that'll narrow down your choices a lot, probably more than you think. Most tubes just aren't available in 48 different butting profiles. There are however, about 36 different ways to do stays, so you kind of have to decide what you're looking for, and what size/kind of riding you are/do.
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