Hi Bob,
I have dug out the three months of Model maker mags containing the Silver Mist articles. Vic suggested the use of 'the Triang Radioslave radio/motor equipment or other lightweight radio control with separate motor.' I was surprised to note that there was such lightweight equipment in 1958.
On the plan there is an isometric drawing of the wheelehouse and upper deck- it's on the right hand side below the materials list. It's how I made the access on mine but I note from subsequent photos in the articles that Vic also made a section of the aft deck removable too- as one piece with the wheelhouse and upper deck, back to B4 on the plan.
If I were doing it again, I'd make a section the width of the wheelhouse removable from B2 to B5- maybe in two sections- basically what Ray has done if you look back at his photos. I don't think you'd ever get those shaped wings to behave themselves if they weren't glued down! Hope some of this makes sense- I know what I mean.
Ian