With regards chassis modifications such as welding major structures on or modifying wheelbases etc. it isnt allowed by the strict rules of the current DVLA system. minimal body mount modification is about your lot , no shortening of outriggers or similar , as the confusing regs state ..
My unofficial view on this at the moment would be .... DVLA are currently treating this whole not thought through area of car construction in their recent changes , as only a paperwork exercise ....so , if you are planning on registering a potentially awkward one , do it now !! before this changes.
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