Try and buy one already done... thats what I did- But look for a reputable company.
The cars are reliable enough but remeber its very highly tuned at 300bhp no matter what engine you choose and no matter how your gonna drive it life expectancy is always lower.
IMHO Dont touch a ZVH with a shitty stick. 1.6/1.9 cvh or Zetec turbo's seem good.
But thats just my opinion
J