I'm not afraid your swing arm will bend. The tube won't bent. Just as long as you install an reinforcement in the corner. I'm more afraid of the wheel axle. It looks like a standard front axle mounted on one side. The standard front axle is not sturdy enough. You need an axle of about 20mm, about 0.80".
I also don't understand why the pivot of the swing arm is higher than the sidecar frame?
Third point, the rear mounting looks solid. But the front mounting point looks as if it is welded on a crash bar.