You might send a private message to Van for more info. As far as the foam, as I understand it, it is so you can staple thru the backing webbing thru the luan strips and allow the staples to penetrate all the way, then you flip over the whole thing on a concrete floor and flatten the protruding staple ends.
My thoughts on the project, perhaps instead of the nylon webbing strips, use canvas as a full size backer, more glue surface. Instead of the 1/4 inch dowels between the strips, perhaps foam backer rod.
1/4" Closed Cell Backer Rod - 100 ft Roll - Amazon.com
The 3/8 inch might read better from a distance.
Helpful Hint #1, If you don't have a good local source for canvas, try the canvas drop cloth available at big box and paint stores, usually very good pricing.
Helpful Hint #2, Another money saver, especially considering the volatile price of luan thin plywood is to keep an eye out at your local Habitat for Humanity Restore for wood paneling. Both the hardboard type with the printed finish or the plywood type. You can use the back if the grooves get in the way.
My thoughts on the project, perhaps instead of the nylon webbing strips, use canvas as a full size backer, more glue surface. Instead of the 1/4 inch dowels between the strips, perhaps foam backer rod.
1/4" Closed Cell Backer Rod - 100 ft Roll - Amazon.com
The 3/8 inch might read better from a distance.
Helpful Hint #1, If you don't have a good local source for canvas, try the canvas drop cloth available at big box and paint stores, usually very good pricing.
Helpful Hint #2, Another money saver, especially considering the volatile price of luan thin plywood is to keep an eye out at your local Habitat for Humanity Restore for wood paneling. Both the hardboard type with the printed finish or the plywood type. You can use the back if the grooves get in the way.