So there would be one huge hole instead of several smaller ones. I'm not sure that's better.

[ He saw that wad of TNT! What's a kid going to do with all that lot!? ]

If the mini sun doesn't work out then the light greenhouse might help to warm them up.

[ And hey, it makes less work for him. He wouldn't have to spark up a bonfire or anything. ]

Think you can drop by and give this a go later today?