TL;DR No
I've done a lot of development with the Tekla Open API and as mentioned in a previous post they do have a support forum that's pretty active and has plenty of content.
If you own Tekla and pay for support you also have access to the support centre for your country who are very helpful. If they don't know they pass it higher up the chain for an answer in a timely manner.
While there are a few Tekla users here no doubt, I don't think we have the numbers to make a real difference. If you do though I'd be glad to help out.