Gaining

have you actually contacted any bbw models? and which ones?

another suggestion does it have to be a bbw model? Look at what fatfanplus does with his gaining podcast, maybe he could be interested

I think your biggest problem with responses to this might be the relatively small amount of people who happened to check the forum at the right time. If it were advertised to members in a way they're less likely to miss, I think you'd see a great response!