My next 1911 will be a Roberts defense. It's almost finished! Anyway it will be a little over the price you posted. But you'd be getting a semi custom/custom gun. All hand fit/ no mim/ Vz grips standard/one gunsmith one gun start to finish no assembly line crap. Lifetime warranty.
I didn't order one with a rail but I know they do offer one that has one. Besides the standard colors/ finishes they do cerakote for a little extra, any color. I went with sniper grey with black controls. I'm sure they can do fde for you.
My first 1911 was almost the kimber warrior you mentioned. I went with a differ t model wish I would have bought the warrior. Love the way they look. Mine is stainless but I have read kimbers kimpro finish doesn't hold up that well? there is a dealer near me that has a ton of kimbers in stock. He told me these days he has trouble selling 1911s maybe he would give a good deal on a warrior for you?
But then again if your going to pay around 1500? For a kimber having a Roberts defense wouldn't be much more?
Found a pic of their railed model.