Reef tank question

[MustangMX]

Hey guys this is what i will be working with, sorry for the crap pic, I just did it fast been really busy.

So this is the basement and this is what i had in mind as of right now the fish room would be in the mech room that has a drain and i will be installing a sink after. What im not sure of doing right now is doing the tank outside what i have in the pic right now or to do a in wall tank and have the glass flush or to do 1/2 and 1/2 , have the tank in the fish room and half the tank in the other room, If i were to do the 1/2 and 1/2 then i would most likely make the fish room bigger.