Surface Pro Brace

Made a few edits to the original design:

1. increased the screen lean-back angle just a bit (allows the kickstand to add extra support)
2. narrowed the screen clip a couple of mm so that it doesnt overlap the display screen
3. increased the gusset support a little larger (may not have been necessary - not sure)
4. trimmed back a few of the edges slightly to make it easier to put on