When someone else has republished on me, the puzzle just reloaded. So I think you will be safe. But I am not 100% sure about this.
http://steamcommunity.com/profiles/76561198000487094/myworkshopfiles?appid=620

thanks for the suggestion! I Dont know how to change the test without having to republish the test and that would cause it to be removed from all the subscribers who have downloaded the test. So I'm sorry that if there is one portion of the test that if you dont do perfectly the chamber is unsolvable. What the mad fool said is exactly how I would correct it. if anyone knows how to solve the problem without republishing then please tell me. Until then, save often!

I had no problem getting the exit door to open. You just have to reposition one of your portals. However, if you don't drop the lazier cube right, then there is no way to retrieve it. I would add another small secret chamber that has a pedestal button that drops the lazier cube. This chamber would open when the lazier cube would drop and near where it drops. That way you can reset the cube if your drop is off without having to reload or redo the puzzle. Just my opinion.
http://steamcommunity.com/profiles/76561198000487094/myworkshopfiles?appid=620

Good test. but exit door don't open.