Yes, composite materials can be used to Construct your 2x4 Basics Chair Kit.
The AnySize Chair Kit has been tested to withstand standard household needs. We do not have a weight rating we can provide for these products as the rating would depend on the grade of the lumber used.
I wouldn't go longer than 6 foot
Two ends and 40screws...Need to buy 9 treated 2x4s
You can but this bench is pretty darn heavy
The height is 31-1/2" and the width (front to back) is 29".
instructions say no
On these brackets we do not have any weight guides. If you are looking for load ratings on shelves and such after being built, we find that there are a number of variables that would determine this, such as length and type of lumber being used. We are not able to factor in for these variables to provide a weight limit capacity for these.
You get the 2 resin end pieces and all of the screws needed to attach 2x4's. You will need to purchase the 2x4's and cut them to your desired length. I built 5' benches and ended up spending less than $100 total.