Hi Gary,
It's a good article, simple and clear. I'd just like to make one comment.
If you cut the birds mouth with a table saw you should be sure to use epoxy or at least a structural glue that is gap filling. Do not use resorcinal (spelling) glue as it is not gap filling and your chance of failure on the glue line will be quite high.
The above warning is because a table saw does not cut accurately but will wander a little, resulting in gaps no mater how careful you are. If you are using one of the non gap filling glues, you need to rout the birds mouths with a router.
Resorcinal glues have no tolerance for gaps at all even though its still one of the very best glues for boat building.
Is the weight that you gave (85kg) that of the finished product (wooden pole glassed painted and with fittings) or just the bare wooden pole? I ask because my steel foremast on La Chica is 10M over all (195mm at partners, 80mm at top, 90mm at base, 3mm wall) and finished (galvanised, painted and fittings welded on is 120Kg.