Modular firebox system?

I've been stewing a idea in my brain for the better part of two weeks and want to see if anyone can dissect it more than. I love cooking on a stick burner, I use one made from a 300L propane tank, so a decent size, but I only cook day cooks on it, ribs and whatnot because I don't want to feed logs all night. So, my idea is a modular smoker, a decent sized cook chamber, 200-250L propane tank, with interchangeable fire boxes, one for wood and another being a pellet hopper.

Some issues I've been able to come up with so far are, the fire boxes would be heavy so suitable connections would have to be designed. Would a pellet hopper be able to hear that much space. Air leak issues between the fire boxes and cook chamber.

Unless someone can come up with some issues I haven't thought up yet? This is probably going to be a winter project so not going to start on it any time soon.

Ah sorry I copied and pasted this from my facebook and didn't realise I left out the I cook on a stick burner but it's not mine. There is a local roofer in town and he has one but only uses it twice a year so I've been borrowing it for big cooks; grandmas 99th, bosses birthday, etc. I've wanted a ys1500 for a long time now but I absolutely love cooking on wood and only have room for 1 large sized put trailer.