At times, I am inclined to agree 
On-topic: How would there be streamers? Is the shielding welded, bolted/flanged or ?
That just means that there is alot of activity in my head, HD. Use that to your benefit, the forum is open.....

OK, follow me here.
From the inside out, here is the layout:
The source is first, then the source casing, then the DU, then stainless steel.....so it is 4 layers.
The constructor is not in yet, so the attachment method is not clear just yet.