The softer windscreen I just did for Todd wanted to collapse a bit when I pulled the vacuum, so I re-heated a little hotter and backed off the handle a bit. they cam out good, at least very usable. The harder plastic ones do real well. I may try to build a larger one in the future, I like your build on that. I just don't have a large part need yet. And I really like the portable, on the moment machine I have.
Bob