Great! It does work. I did not master the templating yet (didn't even start actually).
You said that fieldset is already there... In seb_one divs are there. Could you please suggest template, where forms are rendered with fieldsets from the start. I guess I can rewrite that myself, but it could save time...
Couldn't find no "thank you" or "reputation +" buttons in this new seblod on seblod forum, so i just thank you for the support )