Thanks Flemlord, So they are using my standard product services already, but would like me to develop this for them as sort of a joint-venture since they trust

Thanks Flemlord, So they are using my standard product services already, but would like me to develop this for them as sort of a joint-venture since they trust my expertise in this area. The idea isn't better or worse, it's related but it's custom. So I can't scrap my startup for this product - it's very much a unique design that only will work for them and their clients. No reselling opportunity but possible money while I build my business. I'm considering working on it because during these lean months it might be nice to have a side gig that can turn into another revenue stream while I continue to build my primary business.