With bits of a Sammio thrown in for luck
http://www.ebay.co.uk/itm/1913867685...84.m1555.l2649
It looks like it's been chopped up and experimented with, but nothing that someone with a bit of patience shouldn't be able to address.
Given how much you'd be saving, even if you're a novice builder then this has _got_ to be a good project on which you can experiment and make mistakes!