Just finished modifying the front end of a hbbc delux beach cruiser that was supposed to be part of a giveway for my business. I say supposed to because I had so much fun riding it I think it'll be permanently in my garage after a custom paint job. Will post a shot tomorrow. Dont know if anyone has tried, but the springer front ends only need some hardware swapped out to take any width you like!
In the pic I have a Chunky Monkey set up tubeless but I have since switched to a Maxxis Ikon 2.35 which I much prefer--it's faster, lighter, and provide plenty of grip. It's also set up tubeless on a Surly Rabbit Hole using a split tube.
My Mountain Cycle FRumble. It's intended as my DJ/Trail/Urban bike. It's a 26x2.35 rear. The fat front does make it slack which is what the bike is intended for; a 120-140mm fork. It has a short 50mm stem which I'll stretch to a 80mm so I can climb a bit better on it. It sits at about 33 lbs. Once I replace the cheap boat anchor tire and go tubeless I should be down to 31 lbs.
After having a problem with my fat frame I have built up this as a temporary fix until I can afford a new fat frame. It's a flyxii carbon 29er frame, Dengfu fork and 80mm front wheel, on one floater tubeless. Stans crest with maxxis minion DHR 2 on the rear, only taken it for a quick spin but it's insanely light and feels great to ride.