Hello and welcome you to Zealot!
Welcome back. You have come to the right place for all things paper/cardstock, and to build and hone your skills. The members here are very helpful.
YEs, UHU02's models are rather challenging. However, I have found them to be challenging in a good way. However, they are not models that I would recommend to someone who is just starting out in paper/cardstock model building.
If you have any questions, comments, concerns, need help or advice. Please feel free to ask and we will do what we can to help you (or at least point you in the right direction).
When you start a new project, please post a build thread. Build threads are a great way of show off your work and skills. Not only that, but if you run into an issue with a model you can highlight the area that you are having problems with and we can offer you some suggestions on how to deal with them.
Once again, welcome aboard. I hope that you enjoy yourself here. I look forward to seeing your work.