and i am planing to get 7 8 foot long 2x4s. 1 4x4. 10-15 sq ft of turf. 4-5 sheets of plywood. will this be all enough to build a 5 foot high table and down ramp plus a landing with turf and some 3 2 foot wide boxes to go over my grass? by the way my table is gonna be 5 feet long by around 3 feeet wide and down ramp will be 2 1/2 feet. will this be enough suppplis?