that's about as good a deal that you'll get on a revo roller as far as the conversion it depends on how much you fab yourself and or buy and what you use...i went the uber expensive route...ultimately sold it though...
if you bought this you'd be out about 500 with just the chassis alone
but if you use the stock chassis and make your own batt trays and fab a motor mount you could do it for little of nothing...also depends on bl setup...if you use say a novak it's not that bad @300, if you use a mamba max controller/and say a 10xl you're looking @10xl but then voltage amounts change...so really it just depends on you...however i am by far not the most knowledgeable in the subject...hopefully all the other guys can give you some input