I just installed a new Sterling Vikrell walk in shower. I predrilled holes in the mounting flanges and there is a crack from the top of flange down and thru one of the holes and one of the ribs under the pan had the edge cracked off when I took it out of the box but that should not hurt it. I need a second unit for another shower and now I am very concerned with how brittle this seems to be. I am wanting a pan and walls for a remodel but I want one 34-36" deep by 60" long so is there still fiberglass units out there? I thought fiberglass was good but I am not sure and would like some ideas on which material would be better. I could use a one piece unit but it would be more work. Thanks