Andy,
What a wonderful little 'work of art', if that does not get a few more Shannon builders making their own [using your step by step guide], I do not know what will!
I know you have good access to the actual boat and probably took your own measurements, but for those who have my DVD of Shannon photos in Folder 2 [if that was included in the earlier ones] there is a work sheet drawing from the Furuno Electrics Co. Ltd. site of the DRS 12A radar. I have attached a photo here.
Sorry to intrude, but thought this might be of help.
To you and all your followers -
A very merry Christmas and a Happy Modelling New Year!Thanks for your card, comments and 'pressie'; keep up all of the good work and help on this model.
Kim [Canterbury Coxswain]