I think it will fit to spare also. It should give you ~ 50F worth of protection- by itself- on bottom. On top will depend on amount of gap, but I'm thinking there won't be much gap. Then there should be room to add plenty and handle serious temps.
Any way, if/when you get one, you will be the first to tell us how it works for you! Looking forward to the report!
For I consider that the sufferings of this present time are not worthy to be compared with the glory that is to be revealed to us....that the creation itself also will be set free from its slavery to corruption into the freedom of the glory of the children of God. For we know that the whole creation groans and suffers the pains of childbirth together until now.