I would estimate 100 hours minimum. Probably higher depending on how finished you want the rear half to be. If it's going to get wheel tubs, add that in, as well as finishing the bed and floor. Without a lot more details, this is just a guess.

You will also find out that the majority of shops don't like a customer bringing all his own parts without having any input as to what parts are used. Would you take your own steak to a restaurant and have them cook it for you?????