Thanks for all the replies!
The argument against gussetless designs is a good one and made itself apparent to me when I tried out different ways of folding with thinner fabrics. A fix that atleast feels proper for now was to add an additional `reversed` fold on both ends that would have to unfold entirely before the bellows could be opened up beyond what is structurally sustainable. On its own and definitely when mounted in the frames it has enough strength to stop the bellows before the folds can pop out and it feels pretty absolute and unyielding. It would be interesting to make a mental note to see if this strength disappears as the push vs pull evens out since this is due to the fabric becoming more lenient and broken in and also I havent tried to destroy it by playing to heavy or rough and im sure there are player who would be more demanding in the way they work the bellows. so i suppose im not arguing against the fact that traditional bellows are tried and tested and still around for a very good reason as much as im saying that allthou everything Dana Johnson says is true in theory it hasnt made itself apparent in these bellows because of measures i made against it happening. I did not know about the stagi gussetless designs and will look into that to see if there are things i will avoid or adapt into my own endeavours and a few of the youtube links are also new to me. So again, thanks for the very helpful replies.
I am considering getting a proper set of bellows and the prices for those are definitely not bad at all. It was neat however to be able to put something together that worked and to bring it on the tour im on now instead of coming home to a package waiting in the mail. It ends up being more practicetime for me and theres nothing like the trial by fire-esque realities of bringing something on tour. If it holds its own on the road its good for most places. It should perhaps be noted that im not touring in a band where i play the concertina but it gets played whenever i have time between tour-duties and that ends up being one or two hours per day even if it isnt actually on a stage.