Personally I feel that a cement pool is your best option they are more durable and keep their looks, Fiberglas tends to loose its luster and and become dull looking after a few years.
There are three main types of inground swimming pools: concrete, vinyl and fiberglass. All of which are prone to the occasional crack. Luckily for the homeowner such cracks can be repaired. If you are handy you can purchase a do it yourself repair kit at your local pool specialty store.
I did not find an installation manual for you, but I did find an step by step guide that shows how to build an inground swimming pool on a website. This would be helpful for you if you haven't already purchased a pool and you wanted to see what would be involved in doing it yourself. http://www.royalswimmingpools.com/construction.htm
MAX-GAIN SYSTEMS INC. is a company that sells fiberglass rod. The website to purchase the fiberglass rod is www.mgs4u.com/fiberg.htm. www.mgs4u.com/fiberg.htm has fiberglass rods and tubes. There are no large dept stores that cary them but Amazon.com does have them.
One can purchase pieces of fiberglass from Fibreglassdirect or ECFibreglasssupplies websites, if one lives in UK. Also one can purchase it from Fiberglasswarehouse website.
Fiberglass can be purchased as sheets at any home improvement store. One can also purchase spun fiberglass insulation, depending on your needs.
One can purchase fiberglass tanks on websites such as formedfiberglass, aquaticeco, etc. These sites sell fiberglass tanks with different shapes and sizes so customers can choose what they like, or they can ask for custome-made.
www.columns.net may be your best choice.
Fiberglass shower stalls are available for purchase at most home improvement stores. Home Depot and Lowe's should both have these shower stalls in stock.
A person can purchase some fiberglass grating from several different retailers. Some of these retailers include Grainger Industrial Suppy, ZORO Tools, and Drillspot.
Lowes does not sell their fiberglass floor grating to the public, but a contracter would be able to purchase the grating
Royalswimmingpools.com sells inground pool kits nationwide and they sell to the public (no business license necessary). They are shipped from Georgia, so this is probably the best bet for you.
One online retailer that sells fiberglass columns is Crown-molding.com. They offer a wide selection of columns with free shipping. You can visit the website at : http://crown-molding.com/fiberglass-roman-greek-columns.aspx