I use a couple of cookie cooling racks zip tied together and then nuts and bolts for legs. that way it is big enough. I got a 12x24 heating pad from amazon. Has 9 heat settings and you can change it to no shut off (but can be used with shut off just not with a MHP. LOL). I just ordered another one to have so I am sure to have a big enough space. I know $ is different for you but this one was only $20 USD. I have used one of them for 2 years with zero issues! I can look up the name to see if amazon has it for you.