single speed mountain bike for my needs?
i am a roadie at heart, but am trying to get more into mountain biking to change up my routine. i "borrowed" my little brother's mountain bike, but just can't get into riding it. its an 04 giant bolder, and weighs twice what my road bike weighs, and is a little too big for me (i should be on a 19 or a 20, his is a 21). even in top gear, it just feels lethargic. the schwinn rigid mtb i just sold was far more enjoyable to me, and was about 5 lbs less. im not obsessing over weight, but i really seem to notice it.
now, there is an old caad2 headshok f500 frame (in my size) i can acquire for next to nothing. i think it would be a fun project to turn it into a single speed bike. i have access to most of the parts for free, even though they will be on the older side of things. realistically, what am i looking at as far as problems in the buildup? also, are there any old style freehub hubs with disc brake compatibly? id love to think so, but i am doubting it. its not a big deal if they aren't offered, i will just stick with rim brakes.
im kind of envisioning this project as a big version of the bmx bike i never got as a kid. loads of fun, light, fairly durable and fun as hell. am i crazy?