I would ditch the tower speakers and go with wetsounds. They are much cheaper, and will sound as good, if not better. The MC speaker cans look great, but they are just too expensive!!
I would also skip the MC mirror, and get a PTM edge mirror.
Fender clips are a good idea, if you want a clean way to hang your bumpers.
Heater and hot water shower are both really nice for early and late season.
I was going to tell you that the 6.2l might be a bit overkill, until I saw the weight on the X10...... It will certainly have plenty of power, but the X10 is not as light as I thought.
If it was me, and I was trying to stick to the budget that you are at, I would swap for the 6.0l and add the fender clips, heater, and raw water shower.
Which tower did you get?? If you got the ZFT-5p, I would do the over-tower cover.