Much has been already written about the chinese KAT, so i won't bore you with many of the particulars.  I have been asked a couple of times though what i thought of it........I would venture to say that some unique building skills are required to make this a more working models.  I was disappointed but not supprised at the workmanship.  Loose screws, missing screws, filled-n-holes, bent-undercarriage (when received) loose turntable, etc.  Over all though, i figure that i have a good set of parts to work with at a relative inexpensive cost.  For the time it would have taken me to get all the pieces drawn, laser cut , time involved, i would have spent close to this money money.  
I have already started changing some things on it.  
Square-up body
Replaced these with.......
With this aluminium C-channel.....and machine shop making idle wheel, this is not a bicycle,  two sprockets on one chain doesnt work.
Tapping M5 holes
Nylon bushings with nut inserts