No need to message me, I have email notifications enabled on all my add-on release topics.
I'm having 2 issues with your gravestones.
1. The brick icons don't show up in the brick menu it just displays a big question mark.
2.
These issues don't show up for me.
Try redownloading? Not sure what's going on, the icons have been there since day 1. I'll try uploading the add-on I have in my blockland add-ons folder to my site but it shouldn't be any different.
looks like he messed up UV mapping
I did make these via the old-fasioned way I used to make my bricks, through editing the blb file with a text editor, so that is a possibility. But, they seem to look fine for me.
Also, I made the cross print using the brick side print as a base. I went pixel-perfect to make sure the inside corners were right, and I applied an alpha background to it using layers.