I'd go for 3 months. Could I start with something that is already built if it gets torn down, many things changed and turns out completely different? I'd like to use an existing bike and heavily modify it rather then building a new one.
^ What he said...Too late, it's 4 months....
But yeah, take a bike apart..
change/repair/remove stuff...
Reassemble as you like. Done.
Carl.
Luke.