Building yourself is a very satisfying experience. Gives u a project in the shed when ya missus is getting up ya nose.
Even if you are not mechanically oriented help is not too far away. Most anything you want to know can be found here.
You'll prolly find u end up doing stuff more than once but that's all in the learning process.
When you're finished you'll know every nut/bolt on the car and will be able to diagnose any little problem you may have later on. I know blokes who have bought second hand and they spend a small fortune to fix the car when something goes pear shaped because they don't really know the thing or are a little unsure of how to go about it.
Building it yourself gives you a whole different perspective on the thing.