Is it possible to make your own maps on a computer and put them on your memory stick like Worms Armageddon? If so, what are the dimensions, etc. needed for it to work?

Nope. Perhaps one day with a third party hack but not at the moment.

Damn. Oh well, I downloaded the ones off the infrastructure though and they're good because they are WA and WWP maps.

If you own a copy of Worms ow2 make maps using the landscape editor then go into (on the PC) ms0:/PSP/SAVEDATA there make .zip or .rar file & upload them to site.
thats how i do it.

BTW does anyone have trouble with the maps like you can't jump or move.
The only way to move is by teleport, jetpack or the rope.
Team 17 devs may help with this.

You don't have artillery mode on do you (dissables movement of worms, this option is set in the scheme editor)?

ah it must be.
thanks.