PROBLEM 1:
Can it hold?
SOLUTION:
The 1:1 scale proved that my stool can withstand the weight of a person.....me.

PROBLEM 2:
In the pictures below you can see some tearing at the corners where the stress is very high.
SOLUTION:
I have managed to solve this by ensuring there are some strees relief cuts at each corner.

PROBLEM 3:
Locking sytems?
SOLUTION:
A simple mortice and tennon joint running along each leg holds the stool in place.