I have to agree with you there
Would have to think long & hard at building a sub £700 chassis. Heck of a lot of work involved for not a lot of gain
One thing that confuses me. Why are the 4 seatbelt mounts not included ??
4 Bits of 40X3 strip steel with a nut welded to it . My 7/16 unf nuts cost me a massive 4p each & took all of 5mins to make ( Perhaps they do not have the use of a drill !! )
Perhaps it would be wise to ask a few questions, perhaps ask if you can view a completed chassis