2 points:
First, it isn't a Porsche turret, Porsche had nothing to do with turret-development, apart from making sure the turret ring in the hull had the right diameter. In fact, this turret was being developed already when Henschel was designing their first Tiger-2 (VK-4502(H)) which was a project to equip a Tiger-E based vehicle with the longer L/71 88mm gun and having sloping armour.
Second, these first 50 Tiger-B's were all par 2 sent out to be painted by crews in the field, thusly, no hard-edge camouflage on them. I recognise the camo as the one seen on some early Tiger-B's on railtransport to Arnhem, September 1944, however, that is soft-edge camo.
And I agree with the notion Dragon actually made the Zimmerit TOO good, it is very well visible, where it should actually be less obvious. Look at pics of tanks with Zimmerit, and you see that even from a medium distance, that Zimmerit patters tends to "blur" and become rather unnoticable.
I would recommend every to not add washes to these kits, nor any drybrushing over the Zimmerit as that will no doubt make it stand out WAAAAAY too much.
I have the earlier kit, the Tiger-B with Serien Turm and the Zimmerit. I do tend to see that on the edges of the hull and turret, it is too neat, too clean, too well done. Pictures show that Zimmerit was applied rather messy in certain cases, but in average, either the edges were almost clear of Zimmerit, or it was blotchy. But not razor-sharp as on these kits.
As to damaged Zimmerit, unless you portray your Tiger-B as having taking heavy fire, Zimmerit on Tiger-Bs generally looks untouched. Contrary to Panthers, where you DO see damaged patches. It makes me think Henschel applied the Zimmerit differently than MAN, DB or MNH.
Anyway, looking forward to seeing the end result and my advice would be, add some softedge to the camo. Not much, but it was there. Here's a tip, drybrush the Dunkel Gelb over the edge with the Oliv Grun, that will blend in the edge and give it the right look.