The shower in our master bath needs to be replaced. We have a half moon type corner shower there now but it leaves a little gap from where the shower ends to the wall which is basically wasted space, so I would like a shower that goes straight across from wall to wall, therefore, it probably needs to be custom made. I am just not sure the best way to approach this. Should I call a general contractor for this, or should I order it from a shower/plumbing supply place and then call someone to install it?

Also if anyone has any recs please send them my way. TIA!