<font color="blue"> The guy who duck-taped the dead-man's handle on his mower, then cut off some of his fingers emptying the bag. He then won a large settlement by claiming the dead-man's handle was too easy to bypass with duck-tape.
The guy who injured himself using his mower to trim hedges from a ladder. He won because there was no warnings in the manual or on the machine to not use the mower to trim hedges form a ladder.
The kid who lost some fingers when his father told him to lift up the mower so he could adjust the height of cut WHILE IT WAS RUNNING. They won because there was no safety interlock to prevent height adjustments while the mower was running even though the manual and markings on the machine clearly warn to stop the mower before adjusting the height.
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I am about to become violently ill. I have just about had it with people who have the nerve to even try to get away with stuff like this, and the juries out there that actually let them get away with it.
As to your ROPS mods: I am VERY big on safety, but I am also very big on common (uncommon?) sense. I would seriously consider investigating the physics and geometry involved in using the same type of sleeve system you are describing, but also lowering the ROPS in the process by whatever it takes to allow it to fit into your shed so that you don't have to "fold" it every time you go in and out.
Life is a series of calculated risks. If the numbers add up for you, do what makes sense, given ALL the factors.
Besides, from the sound of it, some idiot will sue you no matter WHAT you do, including forgetting to put the cap back on a tube of toothpaste.