I guess the question is do you have the skills to take on such a project? Also Do you have the equipment/tools? If this is your 1st build I'd try something a little less challeging like a S/B turbo or something. Sure it'd be cool but at some point you have to ask yourself am I going to be able to do this? Getting it all stuffed into the car is only half the battle.
As for the dash just look on e-bay for another unit. Getting the factory gagues to work will be a matter of finding the right sending units.
Good luck.