alrighty here you go - https://steamcommunity.com/sharedfiles/filedetails/?id=2920542898 (@Captain Callum preferably I was going to go for wood.
So sorry! I shouldn't have wasted your time to ask - I never even thought of the workshop, I can look there! I don't normally use it, I guess there is a wealth of stuff available that I am missing out on. Sorry, Captain!

ok so a basic wooden sign board is simple enough
- using base game wooden posts, the 1 metre post is handy for the sides, align to surface and snap angle to the sides and then move onto each side and lower just below the sign board. Do this for every side to get a nice wooden border
- With a wooden border now, align to surface or snap angle to the ground. Place the 1 metre post at each corner just high enough to join onto the wooden border but not high enough to break through