One issue on painting it. I used to be an automotive painter and you need special (expensive) primer in order to paint that, it is galvanized aluminum.
I would add a wall with a door in the front. IN the back, about 1/3 up from the floor I would build a 'shelf' that spans the width and you could place your nesting boxes there. Run some 1 1/2-2" thick tree branches of rounded over 2x3s or 2x4s as roosts.
I would add a wall with a door in the front. IN the back, about 1/3 up from the floor I would build a 'shelf' that spans the width and you could place your nesting boxes there. Run some 1 1/2-2" thick tree branches of rounded over 2x3s or 2x4s as roosts.