re-doing and expanding our deck. plan to use Trex for the decking. i would appreciate suggestions for design features. the deck will be elevated with a patio below it, a step-out from our kitchen, with a stairway to the backyard. dimensions about 10' x 30-35'. thinking about grilling area, bench seating around a fueled firepit, hot tub, in-railing lighting. but haven't done this before, so asking for ideas from your experiences. thanks.