I'm not sure if you're planning on putting 26" wheels on as well, but one thing to consider is that if you do, you'll end up with a lower bottom bracket and you won't have as much pedal clearance as you might like. You could switch to shorter cranks if it becomes a problem, but that's not an ideal solution. Why not buy a $50 Specialized Hardrock/Trek 850 or whatever 90s mountain bike you find that fits you? I don't know how it is where you live, but around here the things are a dime a dozen. I've got more than I know what to do with, all from the trash. I'm a cheapskate too but I do like having the right tool for the job, so to speak.
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