Mark,
I've searched through the previous forum software for your username, your email address, etc - I'm unable to find anything other than what we have here. I show you registered in 2017 and only have a handful of posts.
I know that with the previous forum setup - they did lose some data. Much of it I was able to recover - some of it was just flat out lost permanently.
Do you know if you were ever a supporting member? Did you ever pay for membership? I've asked Adam to check paypal & stripe for your username.
I'll dig some more - is there any data you may be able to give me about your build thread that may help me locate any threads that might have not gotten converted?