It is typically nice to visit your Parents!
The Grill is a lot of steel! What are you going to haul it in? Do you have the man power to unload and move it around when you get it home? As far as controllers go, whatever is on the machine will be obsolete, next year. In the event it dies, they likely are in stock, or there is an upgraded controller available. If it's cheap <$100 get one but I doubt I would tie up more money on a $2K+ puchase.
I spoke to Chris, the owner, some years ago about a custom job. He basically said, the smokers and grills are hand made and pretty much anything goes, especially easy stuff like extra shelves and guides, thermometer bungs, etc....JJ