It appears to me, that no one currently produces a Ju-88C-6 in 1/300th scale.
Perhaps I've missed one, but I checked both the Scotia and H&R websites, and don't see it listed.
With the upcoming, revised edition of the "Target for Tonight" rules due soon, this is a major omission in the German Nightfighter lineup, especially when one considers that from April of 1944 onwards, Ju-88 variants shouldered the burden of air defense over Germany in WWII.
The Ju-88C Zerstorer is also very useful for other sorties too, especially for protecting U-Boats and other German vessels over the Bay of Biscay, from the mid to late-war period.
I've written Scotia to see if they'll consider producing it, since they already produce some that might be used as a basis for it, including the Ju-88A, and Ju-88P with 75mm cannon (can use the nose of this one, mated to the Ju-88A body to make the "C" variant, I suspect).
If you are interested in seeing it as well, write Scotia to let them know, at:
enquiries@scotiagrendel.com
During 1943, and in early 1944, the Germans used a mix of Me-110Gs, and Ju-88Cs.
I'd also love to see a Ju-88G-7 produced too, which is basically a Ju-188 (longer wingtips and squared off tail, with the nose of a regular Ju-88C/G, and an elongated fuselage). Apparently, only 10 or so were produced, but it is an interesting and high performance Nightfighter. Let Scotia know if you want to see it produced too. They already make an earlier Ju-88G model.