That would be perfect, it is a shame about the bar spacing it would have been better if it had been 7mm. I really don't like plastic shelves, I don't know why really but I just don't. I must admit I've kept all the plastic bits and pieces that came with the grosvenor and the HH (except the wheels!), it's always a spare bowl (not that I need any as I have more than enough) and I stick the little plastic houses in the playpen so that they have something to forage around in. The tubes from the HH aren't on the cage but in Boris's ranch lol
Though I'm probably lucky in that my little guys can at least fit in the houses but when I see the size of them I can't imagine a grown Syrian fitting in anyway!