Just came across your thread and let me tell you that your bike is one of the nicest customized sportsters I have ever seen. What a great job you did. I love the color and the wide tires. Really nice workBuy a reasonably priced bike of your choice and use a Vulcan WG triple tree kit for around $500. This kit uses a 2000-up wheel which can be found cheaply on ebay and the like. I used the Vulcan kit along with a set of wheels off a '06 Road King on my '07 883L...tires are 150/80-16's front and rear.
Btw, this kit utilizes the stock 39mm fork tubes/lowers. If you try to duplicate what H-D did you will have a boatload of money tied up in it...they used a mid-glide and an oddball wheel/hub combination. Shown in the above pic's are a tin set off a 2011 SuperLow.