this is great although I I tried it when I was tired and so I ended up with something quite unexpected, but really good.
I made a banner I liked but it didn't fit the surcoat as I'd like, but when I got that to work right, it was wrong on the banner, so I thought I'd give the horizontal flag a go and got the flag looking great, but low and behold, the surcoat is still the one I had from the vertical banner.
so you can have 2 versions of your arms, 1 for horizontal flag and 1 for surcoat and shield.
not sure if you put this in intentionally, but it's great.
if you didn't do it on purpose, I have no idea how managed to get it to work
not happy with how the shield looks yet, but here is the flag and surcoat I am using now
edit to add pix