having allready read "build your own sports car for as little as £250" i feel inclined to compare them both, the tiger avon certainly has better looks than the ron champion attempt, and the tiger avon is based on the much more readily available ford sierra, however it seems that far too much is left to the imagination in the tiger avon book, all the necassary components are discussed but there doesnt seem to be enough detail, having studied the drawings for the chassis in detail, they are lacking serverely in many necessary dimensions and im finding it difficult to transfer them onto cad in order to understand them better. further more, the drawings in one particular place do not correspond to the photos provided. i would think that it would be very difficult for someone without a lot of experience to construct the frame by themselves. in this respect, the ron champion version wins hands down, since a whole chapter runs step by step through the frame construction, rather than just 6 pages of quite vaque drawings. all in all, its going to be a very interesting project, but certainly not for the faint hearted. the frame is of course available to buy from tiger if you dont think youre up to the job, so youd be forgiven for thinking that tiger are encouraging potential diy frame makers to purchase from them by providing inadequate drawings. still, i do beleive that the finsished car would easily make up for any discrepency in the book.