Add a bar at the top of the parallelogram, thus changing from a single bar in the middle to one on each side.
Confirm that in my pieces the corners all have fillets.
The upper connection piece on the right side ("27620_1020_adapted") change the piece to "27620_1224" and consequently the piece "27624_10_1015" to "27624_10_1218".
The connections with the base can be changed from 27624_10_0812 to 27624_10_1015 to be more uniform and increase the safety factor.
Changes:
New: