I agree, it is a bit bulky looking! This is the first time trying this and I was not even sure my design would work.
The entire project cost less than $15 as it was assembled from materials I already had The 4x8 Doug Fir lumber was donated by a friend (it’s his 35 year old patio frame he replaced, thanks Ben) and the metal is welded up remnants from other projects.
The metal frame does not appear to be of any hindrance to working on the anvil, I can still get plenty close.
Having just said that and now knowing how wonderfully this functions, I would change the design ever so slightly to move the wheels in closer on the sides (I deliberately and cautiously erred on the side of stability and functionality when designing this mechanisms).