That makes perfect since, and no need for the apologies
Your trip sounds AMAZING in itself, but to end it at disney... that is my kind of trip.
A lot of it will depend on what kind of park person you are. If you are planning to do 6 days with parks and water parks, it will be tight, but definitely doable. I would also recommend visiting Mickey's Not So Scary Halloween Party while there. This will get you a 7th day in the parks, and a special event. The party ticket allows you to enter at 4pm, so you don't have a whole day, but since you can stay until 12am, you have a days worth of time spent with the special event.
We typically plan 2 days at MK, 2 days at EPCOT, 1 day DHS, and 1 day AK. Especially the age of your kids, you may find 2 days at EPCOT beneficial. The park hoppers will make it nice though, because you can go to all 4 parks in the same day if you wish. We typically have a 1/2 to 3/4 day at AK, and normally end somewhere else that night. We are sleep in and get to the parks around lunch, and then stay through EMH. Making sure you are aware of the best park to visit on that day, and scheduling out your day will also really allow you to maximize your visit.
That time of year, it may also be beneficial to get to the parks early, take a mid-afternoon break to swim or just relax, then head back at night.
There is no transportation from FW to Universal, unless you hire a car, or take a taxi.
Staying at FW will be a blast though. The campground in itself has so much character and charm. We have never stayed there, but DH and I visit every trip. We walk around looking at the different campsite, visit Tri-Circle-D ranch, and always dine at least once at Trails End. The last 2 visits, we have actually done a breakfast and a lunch there.
For an evening of fun, I also recommend HoopDeeDo Revue (HDDR). It is a BLAST!!!! It is a dinner show, and so worth every penny spent!!!