This model is a version of Jazz from the first generation of Transformers, as built from Lego set number 10295 . My goal was to make the Transformer in vehicle mode be exactly the same as the Lego set. Eagle eyed viewers will note that there are some minor differences, a concession to fitting all the interior details.
Theoretically, the model can be transformed without disassembly, but generally it is transformed by separating at the hips and doing the top and bottom halves individually. Due to its complex and brittle transformation sequence, there’s no video proof.