I'm planing to redo the whole blueprint system, should not be that hard (hopefully) because every time I fix a related bug I see 10 potential bugs, I'll re-do the whole thing soon.
I'll look into the stairs issue.
I'll add more characters to the sign, the font name is "Eurof36" :)
As for labeling, for now you can use signs. However I plan to add attachable items soon (Lights and Signs)
Will try to upload a quick update today.
Thank you!