Is the backyard, the park, or car camping the only use?
If so, you do not need UL suspension straps. You could use polyester, cam buckle tie down straps. Read the label for the strap material and strap strength. Nylon straps stretch is why polyester is preferred. The bursting strength should be over a thousand pounds or show a working load of more than 330 pounds. Someone has decided that the working load is exactly a third of the bursting load.
On second thought, the tubular webbing is okay, but there is no reason to buy more of it for this use. Buy the woven polyester straps if you are going to buy something.
To reduce the UV degradation of the hammock and straps, put up and take down the hammock each day. With the right design and hardware it will take twice as long as hanging one towell on a hook, a very short time.
If you watch the prices on Grand Trunk Ultralight hammocks at Amazon.com, you might see one for 15-16 dollars (usually $20) with free shipping over $25 dollars. That first price is about the cost of the fabric, but if you MYOG, you will get to practice your sewing and have pride in what you made from scratch.