One reason for all this is so that you can buy equipment directly from the manufacturer at OEM prices, usually about half the retail price. This is explained in the CG material. This pays off when you sell it. Speaking of the CG, write them at the address above for their free, 52-page booklet Safety Standards For Backyard Boat Builders. It tells you about powering, safe loading, flotation, ventilation, fuel systems, electrical systems, capacity, and much more.
Cold hands do poor work.
Besides, most glues do not set at low temperature. Do not make major changes in the design. In fact, DO NOT make any changes unless you discuss them with the designer. Every detail has a reason. You will be happier, longer.