Wow, what an amazing idea! I hope you will share developments with us, perhaps some pictures when the time is here too. I think most 'pet toads' have far too little room to move around, so I hope you will be generous with the space. I know they really enjoy wet environment, just as any toad, so a small pond is a good idea, and perhaps also an air humidifier. Maybe they will enjoy to have a buddy or two, but if it's different sexes you might get more toads than you can have. It may also be that toads from the same sex are territorial and therefore might fight, although I really don't know this. I'm just throwing some thoughts out to you. Nevertheless, goods speed on this wonderful mission!