It,s easy to decide, if you do DIY and do your own servicing on your car and enjoy doing a good job, then build it yourself, if you don't leave it to the trade.
The value to me of building my car was far in excess of the price Caterham charge.
If you do go ahead, there is no shortage of help either from Caterham on the telephone or any local area club member in person. Go to your nearest local meeting and take advantage of PERSONAL help equal to that available here in these Forums.
If you live in the Yorkshire area I would be only too pleased to pass on any small bits of knowledge I have gained from two builds.
The Pennine Area Organiser will pass on my details to you.
If you think you might be able to do it you probanly can, so do it. And obviously the opposite is also valid.
MAD MALC
S7MAD