I havent' seen one yet in 'kit form', but if it is your first buggy, you might want to opt for the RTR version, as it'll run pretty much 'right out of teh box'

As for building it, it shoudl take you a few nights to get together, but with some of the small parts, you run the risk of loosing them.. (Grub screws, Cer-clips, etc..) Also, being a Japanese model, you'll also probably be faced with metric hardware, and will require metric tool, such as metric allen keys / hex drivers, and wrenches.. Yopu'll probably have to paint and cut-to-fit the body (regular sissors will work, but be a pain!!)

D' oh!! you're in the UK, so the metric thing is a moot point!! sorry mate!!

Compared to buggies of the past, the kits left a lot out; an engine, and sometimes bearings & such.. You'll have to weigh the $$ of buying these items separately, and the cost of teh RTR, which has teh engine installed.. Best bet, is to compare the two in the shop, if you can. that way, you know what is needed and what is included in both the kit and teh RTR.. The shop owner should let you look at the manual as well, and that can let you know what you're getting into!

Kits are usually always cheaper, but you end up paying a little more because of added parts neede to finsish the model, such as paint, or some tools. Also, kits allow for customization, such as particular engine choice, bearing, shock oil, etc.. Not to mention your time involved in building the buggy.

And, you'll probably get more results if this was posted in teh buggy forum, as this particular forum is really intended for beginners with RC airplanes....