Thanks Jesper here's the final update of the construction of the model,
the workable part of the the gun assembly is a simple 3 piece affair and works well, the rest of the mantlet fits well also the only issue with the whole thing is perhaps the two piece barrel is difficult to clean the seam up also the two grooves in the barrel do not meet each other correctly i ended up sanding them out but an after market barrel would be the way to go here.

and all assembled and fitted

lastly to finish up the build is the tow cables which i skipped earlier, i have never been impressed with plastic molded cables and seeing as trumpeter provide 4 decent looking cable ends as extra,s i decided to use them and some clamps from the spares box and two lengths of wire to make my own
the plastic ones

the extra cable ends with clamps from the spares box

and wire added

i just need to rig a couple of brackets for the cables and it is done.
the painting and weathering will follow.
Ron.