well well..
shame you need to insult without re-reading your own question.
OK W didnt answer the strength question.. But since its been stated the hulls are the Marstrom "A" its reasonable to assume the hulls are the same strength. As for tubes I would suggest they are spec'd for the extra beam and weight carried but not a lot more.. Im sure an engineer can work out the extra carbon used by deduction from the published and actual weights of the Marstrom A and the Marstrom M18.

So to answer, as it appears you want the questions answered.

What are the differences between the Marstrom M18 and A Class? the answer as you seem to want it is: its published on the Marstom werb page
Weight? the answer as you seem to want it is: its published on the texel web page
Width? the answer as you seem to want it is: is published on the Marstom web page
Strength? the answer as you seem to want it is: read between the lines on the Marstrom web page. Then use your degree to work out the additional strengthening.


suggestion next time just look it up yourself