Poprivit, Curl's Gibbs is one double I have lusted for from the first time I saw it on his site. Perfect boxlock IMO.

As for the safety on the No.1, a modification is definitely worthwhile.
My 450/400 notched my thumb twice. Guess I am holding it a bit loosely, but even with a tighter grip, my thumb is right alongside the safety and it does not take much movement to catch it. Alex's safety looks like the ideal solution to this and the case ejection problem as well. Maybe a bunch of us could place a bulk order. Depending on cost, I could see putting one on each of my No.1s based on looks alone.