Like UrrBodyH8sMe said, don't bother modding your v1. V1 lasers suck and rarely play dvd backups well or at all. If you still want 2 ps2s, sell your v1 and buy a new ps2. Since you have got kids and because it is the best mod around, I would get a Messiah 2 for your v4 and new ps2(if you go that route). Or you can get an apple chip like me for about $30 less per chip. You don't want your kids handling the discs more than necessry, which you have to do if you use a swap mod like the no solder.
p.s. I replied to your dvdxcopy post too.
