Yeah, I think it'll be:
a) Similar to Carracosta but
b) Good
I'd prefer a tanky Shell Smasher that can take a priority or two before going down, but lacks the power to OHKO walls without a STAB SE hit. Maybe interesting support moves like Taunt and Spikes to give it more diversity. I like the look of a Special Smasher with Giga Drain too, maybe.
Congrats on the Redssssssssssss