So my wife and I bought a house 5 years ago that was already 6 years old. The builders and previous owners never properly protected the deck so the boards have been pretty warped, cracked, etc. It is a 10'x10' deck attached by a ledger board. The joists are spaced 14" apart and are parallel to the house. Originally I was just going to replace the decking but I would like to extend my deck to the left and out from the house. I want to extend it out two feet and to the left 12 feet to make it 22'x12' and I would like to create a 4'x2' ledge for my electric grill. I want to extend the original frame by two feet and run an additional joist in the middle. I would like to cut the current outside posts flush with the frame and place additional posts. On the outside side that is parallel to the house I want to additional posts on the outside corners and 3 posts in the middle section spaced 5'6" apart. On the new side perpendicular side I'd place an additional post on the corner and 1 in the middle that is 6' from the two corner posts. I'd like to run 12' joist under the new section. Does this sound doable?