Hello again everyone I am sorry that I haven't posted much recently as I have been moving house. However before I moved I got some work done and have now got a chance to post about it. After seriously considering the feat I was trying to accomplish I decided to give in and extend the case, to do this I cut straight down the middle of the centre section of the case. I then used 10mm of a spare centre to extend it. This means I can have the cartridge slot internal and still have space for wiring, batteries and maybe some larger heat sinks. Unfortunately I cannot get pictures at the moment however I will get some uploaded as soon as possible.
Thanks