Hey Wilson, It's nice to hear that the Martinez is still plugging along in various forms. If I ever catch up with myself I'd kind of like to build another one of those to see what all the fuss is about.

I think the all mahogany would be ok for a uke type instrument. There seems to be lots of koa, mahogany etc topped ukes out there and it's a totally accepted sound for that instrument. For a classical/romantic guitar sound I'm not sure I'd go for it but all your friend can do is try it out and decide if he likes it. Personally, I refuse to be dogmatic about these things as it's all about what the maker/player likes. Afterall, it's his instrument and he will be the one playing it. If it's for someone else then he might want to consider that persons preferences.

You are wise to advise him to stick to more traditional woods for the first instrument. A Mahogany back/sides and spruce top would make for a very nice instrument and, historically, is quite acceptable. And if nothing else it will  give a point of comparison for the all mahogany instrument.

Nice to hear from you and I hope the move is going well.

Thank you for your kind words.