I am building my Toyan V8 and am very impressed with it, especially considering the price. The packing and sorting of all the many parts is impressive; there were no missing parts and the parts were all very clean and well made. The manual is brief but accurate and well illustrated. The Toyan engineers had to make compromises to keep the cost and complexity down but it looks like they did a great job.
There is a lot of work to be done and some extra parts to purchase before you will have a running engine. If you enjoy building things and can deal with a lot of fiddly little parts then the Toyan V8 can be a lot of fun to construct. Just keep at it, follow the manual and double check your work.