Man gravel sucks! My shop took 25 truck loads not to mention the 30 plus trips I made with a dump trailer grabbin 3 ton at a time. Imine was a black hole for gravel being almost 7 ft at the back corner that had to be built up. Then the concrete was another big hit when it came time for that. Yours is shaping up nicely! Mine is still not done butI am slowly getting my electrical circuits knocked out.