Great work with the ice cut down experiments!
Firstly, to introduce myself, I´m Gwilym from the Aerocene studio here in Berlin. Thank you for all the super work you are doing and helping to make this forum happen!
To give yourself and the Aerocene community some more information on how the cutdowns can work, please see the documents below, created by Alexander Bouchner for his cutdown designs.
The Ice cutdown method initiated by Grace Pappas and that you have been exprimenting with could be used with the rotation cutdown model.
Essentially, once the ice melts it will cause the payload to fall, and in doing so flip the entire sculpture thanks to the second rope attached to the top.
Once the sculpture is rotated, the hot air will escape through the opening that is now at the top of the sculpture.
Please see the helpful images in the document created by Alex!
If you have any questions regarding this, post them here and I will do my best to provide the answers