Here's link to the industrial tins you need (even if you go with DTM they are still needed). All parts add up to around $100 - you'll need some metricscrews for the tin too (I bought a pack of button head hex screw for mine from a Samba advertisor).
Here's link to other rear pieces that are missing -
These appear missing too - might be able to bend and install with push rod tubes in???
I can't tell if this there or not - on the dog house oil cooler at very bottom
Bugpack 36hp Doghouse Cooler Exhaust Tin - Aircooled.Net VW Parts