Hi Mattress,
I don’t know the specifics of the cover but an Aloe Vera cover would usually be a type of viscose fabric (like bamboo) which would be breathable and good with moisture wicking as well so it would probably be a very suitable choice. In some cases there are claims that a cover has been “treated” with Aloe Vera and if this is the case I wouldn’t buy into the story that somehow the Aloe Vera in a mattress cover will help the skin while you sleep (I doubt it would) but if it’s a viscose cover then it would be a good choice.
No … the bottom layer would be flat on the floor and would be compressing less and more evenly (not just in some spots and not in others like it would if the soft layer is on top) and the upper layers would absorb and spread out most of the pressure so the weight will be spread more evenly over the entire surface. In other words … the layer on the bottom will be “resting” and will be fine in terms of durability (see post #5 here).
You have different firmness levels in the comfort and support layers though on each side (unlike a more traditional 2 sided mattress which is the same on both sides) so turning it over would give you a firmer comfort layer and sleeping surface and would be less supportive in the deeper layers which may not work as well for you in terms of PPP. What it really does is gives you the choice of two firmness levels but it’s likely that you would only use one of them most of the time.
Thanks for the feedback … and congratulations on your new mattress 
It sounds to me like you did very well.
I hope you have the chance to share your feedback when you’ve had the chance to sleep on it for a bit.
Phoenix