As long as you have some ventilation. Remember you are going to have smoke building if its too tight.
Electrics seem to be limitied until you mod them with a rheostat for more control. Also and this is a big plus, switch to Playbox Sand instead of water. You will see higher and more constant temps with sand. Remember to place a sheet of foil over the sand to catch any drippings. This way you can add alittle water to it and use it again.
You may want to look into the GOSM Propane models.