It's been a long time since I've posted but made a couple recent mods so decided to share a bit. I have swivel bases for both front seats but always found when they were facing the rear they seemed lower than I thought was comfortable. I chopped some 2x3" steel and put the blocks on the corners to give it a 2" lift. Much more comfortable when interacting in the main living area and I like the higher view out the front windscreen as well. Two inches doesn't sound like much but it made a noticeable difference. Also, 2" is about as high as you can go or the seat will interfere with the inside door handle. As far as head room, I'm 6'2 and still have plenty of clearance to the headliner.