1-does the frame go down when folded lower than this? 

2-this is the lower rear part of the frame where the bottom flap of the seal is fixed in. See that slot in the frame? Does something go on or in there? Am I missing something?

Looks about right for how low it goes. Can't get a good photo at the moment but have this. Just thin foam under the boot covering the frame .

As for the slots, i don't think anything goes in there, just going by memory. Can't get the top down at the moment .

Thanks Dan!