Lowlander, I can only speak for myself , having built a Westfield but bought my Caterham fully built. I would say that they are quite easy mechanically and you could do it no problem especially with all the help on here. The real factor is:- can you be arsed with the long nights in the garage with the missus grumbling about tools in the house, oily trousers, missing bolts etc etc. If you can,go for it, it is certainly rewarding . If you are the easily bored type ( a la Clarkson) you may become frustrated at the time it all takes to do relatively straight forward looking jobs. Cheers Neil