Just want to share my old warning signs that I have been using for all my 1/100 and 1/60 Gundam dioramas for the past few years.
Except for the yellow signs above this post, the 4 images below are high resolution images that you could print on photo paper or any high quality paper for use for your dioramas. I actually print mine on high quality bond paper, seal it with flat coat and weather it with pigments once glued to my diorama pieces.
A few of these warning signs I glued to thin .2mm Tamiya pla plates before gluing to the dioramas. And as these images are in high resolution, you could test print them to fit the scale of your scale dioramas from 1/35 to 1/100 Gundam scale. Hope you enjoy using these warning signs as much as I had fun using them before.