Hi Chris
Yes , Blue-Black over SCC2 sounds good , though it would look good also in SCC15 & black , as per these pics of Accurate Armour's Matador
http://www.accurate-armour.com/ShowProduct.cfm?manufacturer=1&category=82&product=1854
As regards the booms , I don't know for sure but , since the wartime Matador had no booms , you'd assume the QL to be the same . That said though , I seem to recall the the Albions which preceded the QL DID have booms , so you never know . Might be easier to build the Matador instead - I reckon it's an easier build anyway .
Revell Anthracite is reckoned by Mike Starmer to be a good match for Blue-Black , so I'd go for that .
John