there are plans available online in which to convert the toy trap (which opens due to air being forced into the trap when stepping on it). It envolves covering all the detailed parts with tap, and then spraying the whole thing black. Afterwards, removing the tape and adding details. I have though about doign this, but I think I would prefer to just build one. Making the doors open isn't really that hard. I have seen online though, people who have not only made the doors open, but also spew smoke and shake after it closes. It's all about spending money. Having the doors open may not be nessisary, but it's not that hard either.