I found that bolting the L shaped one to the frame of the car before alinging the pipes was easier. I think I still had some play, but not a gap like yours. When I did the pipes first I couldn't bolt the pipe to the frame. Secure that pipe first then adjust the others to fit.
Here's some things I would check, dispite being obvious:
1) The right pipes are used (all the thick ones after the intercooler)
2) are the pipes in the correct way
- If I remember correctly the L shaped pipes are not symetrical. One leg is longer than the other. It is possible you have the L pipes in the right location, but they are in backwards. (The attached picture of yours looks to me like you have the L pipe in backwards. If you turned it around the top pipe would sit at a lower angle reaching further back into the engine bay and lower.)
3) Couplers are in the correct place. The hump hose ones are obvious, but the others are all different lengths. Don't use a long clamp when a shorter one will work.