I've come up with a cunning strategy; play my Imperial Guard force (the mighty Cadian 82nd) in them mean time as they are pretty much painted, and work on the Space Sharks in slower time. If the Carcharodons Astra get finished then I have another army to choose from!
There is rumour of a 40K campaign starting at First Founding (all the work of Neil @ Table Standard) and the rules pack includes an option for Characters to "level up" using a variation of the Custom Character rules from Chapter Approved 2018). This was all the excuse I needed to start the Imperial Hobby Machine once more and kit bash a new HQ model.
Commander Vasquez reporting for duty!