You could, it’d just be really tedious and really annoying to do. When you make something on ROBLOX and then import it to Blender, for some reason ROBLOX/Blender doubles if not triples your original triangle count. So it’ll be really annoying to try and edit and modify to your liking.
If anything, it’d probably be easier to just remake it on Blender. You’ll be able to control your triangle count.
Yeah you should be able to as long as the Tris don’t go over 10k, if they do you have to split it to multiple mesh parts (Which you will probably have to do anyway to get different colors and materials for different parts of your model)
Here is an example: The one on the left is one part, while the one on right is 216 parts.
But for 216 parts it came up to 2592 Tris.
Alright, that’s what I’ll do. Thanks! 
