I have a 2006 XLV and have done some of the same things as you. I Have PPI amps as well and have been very impressed for the price. I use the same cooler under the seat. We upgraded the entire seating vinyl to add a silver carbon fiber accent. We added swivel racks as well as the stock fixed racks (great when friends bring their own toys). I had to modify the stock folding bimini rear straps so we could rotate the boards in, but I love it now. We upgraded all the interior speakers to Kicker and the towers to Polk Audio with a JL 10" sub under the helm. Next year should bring Wakemakers ballast upgrade kit, Z% cargo bimini and maybe a bigger Sub. Ours is a similar color pattern. Nice to get some ideas for ours from others like yourself. Great topic.
2006 Mobius xlv
2006 Ford F150 4x4
Kansas Livin'