I see the challenge.
If you have not, check out https://ubuntustudio.org/support/ Besides having a link to Welcome To Support And Help it has links under “Additional Resources” to a number of standard UbuntuStudio applications.
https://linuxmusicians.com/index.php links to what could be the exact template for the type of site you would like for artists or creators using UbuntuStudio in general. The moderator listed in the welcome section might be a good place to start. You will have to register and log in to connect with him.
Look into phpBB® Forum Software © phpBB Limited which is the platform Linux musicians uses.
Take a look at https://www.bricklink.com/v3/studio/ for ideas for displaying contributors graphics.
I could use the type of site you propose to trade ideas and methods in coordinating several applications in a creative project. I am often using LibreOffice: Write & Draw, GIMP, XSane scanner, Firefox and GimageReader at one point or another to achieve something I would like to share and help others working on similar multi-app involved projects.
A second challenge would be getting a link on https://ubuntu.com Flavors tab to UbuntuStudio.org. New users who not aware that studio help is in separate site could mistake Enterprise Open Source and Linux | Ubuntu where they will find the same orientation as https://ubuntu.com itself, which is heavily large corp technical and application creators oriented, anything but an artist, writer or musicians bag.
A third for you, would be finding artists and illustrators for example who also have creating their own web sites. You might want to start with looking for them in the Krita community.
This is likely the best I can help for now. I likely can do a bit more research if needed.
This kind of support is the sort that would help creative sorts get a smoother start and not have to reinvent the wheel when doing projects that need multi-application guidance. 