Many modern dashboards do convert well. I did a couple by just cutting out each side the same amount and puttying them back in.
This was a right to left hand drive
They have many sizes and it's difficult to tell how they will look, but their downloaded catalog prints with actual sizes so you can tell. The multiple size sheets are also worth it to find the one you need.
I've only used their Welds but find nothing close to the look and ease of application. The door welds on this dragster are Archer and the rivets are a subtle.
Yeah, I used to use this as a quick, cheap filler (and casting medium) for small parts and holes. But, it has been replaced with shrink free, even quicker, Bondic light cured plastic.