DIY--Sporran help--

[Kilted Rogue]

Hey Rabble
I am working on my 1st DIY Sporran and i have come to an impass. I have made my sporran from eyeballing the ones ppl here have shown. The pattern is based on a Rob Roy Style. as you can see from the pictures i don't have a piece for the top flap.

for assistance sake i will number the pieces from top left to right
1) back panel with stiffener 2)front panel with stiffener
3) the gusset.

I plan on gluing the pieces together and then stitching them. i am beginning to question if i have the proportions correct. What to use for a top flap.

I am working with suede and some natural belly leather.

( the size is a little small, I plan to use it for a small bag and make a larger one as soon as i have the kinks worked out.)