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One of my main questions is; the kit has doors over the tail end of the rocket housing, when they are fired, do these doors swing open onto the roof of the launcher, or are they not fitted on UK MLRS as I can't seem to find any pictures with them in view?
These covers at the back of launchers are only on German MARS vehicles, so you do not need them for your project. And I undersand that they are removed before launch.
Before you choose the source for your tracks, you need to decide what type of them you want to use. In original Dragon MLRS kit old style tracks were provided with chevron shaped rubber blocks. Aftermarker tracks of this kind are available from Friul Model (metal), Modelkasten and Academy (both plastic). UK used such tracks for their MLRS, but just as US they also switched to newer tracks, which have rectagular rubber blocks. I'm not sure whether all British MLRS use the new type tracks now, or are older tracks still in use. New style tracks are available from Friul Model (metal) and Blast Models (resin). The cheapest old style tracks are those from Academy (set No. AA083), but they are very hard to find.
Pawel