How much would it cost to have one of these made?

That's a big knife, and a tough grind. On the other hand, the handle fittings are relatively simple. Price depends on who you get to do it and what level of fit and finish you expect. I wouldn't touch it for 600, might for 8. You might could find it as low as 3 or 400 from the right guy. I'm not taking orders, just speaking hypothetically.

If Jason wants to tackle that Bad Boy for $800 Personally I'd say getrdone if I was you!! Course you offer him a little more it might just blow you away when you see her!! Those sweeping plunges look like fun!
Between him and his Bro. Travis their last two Daggers were Awesome!!

Lol, right Tim. I'm not interested, at all. What with Kansas City coming up, and having to move my shop in between now and then, I'm swamped.

I think that what the OP needs, is a talented young bladesmith, that takes the project on as a way to enhance his skills.

It appears to be carbon steel, probably about 3/8 thick and it looks like the carbon steel was used for the guard and the rear bolster?

Do u think it's forged or ground down

It looks hollow ground to me. I'd suspect ground over forged,but you never know. It's all grinding in the end

I agree with Jason on it.

I think I'm going to attempt to try to make one, any advice on where to start first

It would be much cheaper to have it made than what it will cost you to buy all the equipment and materials you will need.

I would think that it needs to be forged to get the correct elongated diamond profile before hollow grinding. I know Jerry Fisk meets with a number of young bladesmiths perhaps he could recommend someone.