I am considering installing a hybrid type pool using fiberglass wall panels and a poured concrete bottom. But, I need installation advice & steps required. Having trouble finding info on these types of pools and how-to requirements. Some big questions include proper sealing of wall seams and correct method of pouring concrete bottom up to the fiberglass wall (expansion material required, pour on both sides of wall, sealer needed at contact point, etc...?). Any help and advice would be greatly appreciated.