I've done this. I bought the panel from AGM directly though. Nice, quality piece. Takes a lot of fabrication though. A lot. You have to create the fan shroud and direct it toward the heater core. All the while chopping your A/C box up for needed pieces. It does create a lot more space on the passenger side which is great. I have tall valve covers and no clearance issues.
Instead of just drilling holes in the top for venting I got an extra door jam vent and cut that in. Looks stock. Pick up a cowel vent screen and you got it.
I'll throw up some pictures if you want to see them tomorrow.