this is a design i made for a raised patio it is 2 feet high four inches of which on ground and 8 feet out from the house and 20 feet long. What i am wondering is in the middle of the patio what do i use to build it up i was thinking some crushed stone then have about 8 inches of road gravel then 2 inches of sand for pavers. The patio is going to built out of xl pro wall and i am going to use 8 inch steps created from xl pro 18" caps and use the regular wallstone double unit to make the risers. this will create 8 inch steps. this is what i designed what kind of price would you be charging for this? the pillars will be four feet apart from each other and they are approx 2' wide each way. i will be capping them just didn't put the cap in the design. let me know what you think and any suggestions you may have.