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No don't worry! Your completely right and I've been way to ambitious for my first frame build.
I'm going to build a steel track frame, I'll still use it a lot. But it will be simple enough for my first frame build. Learning how to build a frame will be more important for now and I'll leave ISPs and weird angled tubes for later in life haha.
I'm going to go down to Downland next week and chat to the guys running the course. I'm sure they'll confirm that keeping it simple will be best.
JamesKJ
@deleted
Hi Buzz Killington here....
The zona tubes will only have about 250mm of butt (don't have dats sheets here but it's around that) at the longest end. You will need to have the whole of the area joining the top tube in a but, as well as the whole exposed isp being butted. As you've drawn it, that's not going to work with the zona, and there aren't any tubes with that profile. Most people I've seen using steel isps either have much less slope on the TT or they use plain gauge (read heavy) seat tubes.
Also, have you thought about how to attach your saddle? Again, otp seat mast toppers are designed for Carbon and alloy frames on the whole, and dont come in useful steel sizes like 28.6.
Not trying to piss on your cornflakes, but itsprobably best to resolve these issues now rather than wasting precious time at the course.