Just a few things that might be worth bringing up..
Orlando is right about "you get what you pay for" Carpet is rated two ways
one is weight usually in oz.. but this is not the only way to judge carpet..
Carpet is also rated in thread count per inch.. when we talk about weight many times the reference is more about the thickness of the backing than the actual thread count..
Thread count is important because when we cover say a live well lid.. we don't want the backing to show through as we go over the corners and bends where the carpet is bent to cover irregular shapes..
Glue.. always use contact cement.. roll on or brush on is OK but you need to make sure you get coverage with out large puddles of glue that might bleed through.. we use commercial spray on glue but is is not something most people are set up for..
about replacing all or part of the floor.. the floor can be pieced together
but double stringers need to added to spliced areas..(never use CDX plywood)(always use BC or other exterior grade) we biscuit and fiberglass
all seams, new wood to be added is coated with one coat of water sealer
then covered with two epoxy resin.. the bottom side is done before its installed.. topside is done once the repair is done..( also, never use Pressure treated wood) why? because for one pressure treated wood is green and will warp and buckle on the floor..the other reason is pressure treated wood is treated with poisons the point is to kill bugs.. this is not a good thing to have on the floor of your boat with standing water in the summer sun tends to leach out the poison and you may be in your bear feet.. this could make you sick.. remember 200 people died from eating from pressure treated picnic tables, this force a change in pressure treated process to help make it safe
If the floor is removed drainage needs to be checked to make sure water is getting to the aft section where is can be drained.. trapped water is the biggest cause of bad floors
air temp for replace carpets should be above 65dreg.. I prefer 70 to 80
because contact glues need a flash time before they are put together
if you do the job under 65 dregs.. what will happen is as the carpet heats up
and does get to 80 to even 90 which is not uncommon in the summer.. the gas
trapped in the glue will start to escape sometimes this happens with no ill effects but we have seen the carpet raise and cause a bubble where the gas is trapped.. its fixable but not something you want to happen on a new carpet job..
By the way here is a link to an article I wrote about turning a john boat into a fishing machine
the carpet installation is part of the article
http://kentuckyanglingforum.yuku.com/topic/2553
Good Luck
Chris "Trimmer" Erwin