A couple of thoughts that might be of some help.
I don't know about other countries, but if this project is to be based in the US, then a 501(c)(3) charitable organization will need to be set up. Else proceeds from sales of books or calendars will be taxable. If a 501(c)(3) is set up, then a number of specific things will need to be addressed such as the naming of a board of directors, specification of the charitable function, etc.
If you are going to publish a book or even a calendar of pictures, then presumably you are going to want fairly high quality photographs. Much of what is currently in the Showcase section probably wouldn't do for such a project. Thus contributors are going to need to be much better photographers than they apparently are currently, or they will need to hire someone to take pictures for them. Presumably, if they hire someone, the cost would be deductible by them as a charitable contribution (in the US).
The organization will have to pay to have the book actually published. Presumably for a book of photographs, the paper will be fairly high quality glossy paper. My guess is that it won't be cheap. This will have to be financed by cash donations to the organization or by a loan to the organization. And my guess is that the publisher will want the payment up front.
Given the above, a checking account will need to be opened.
A business plan will need to be developed. A budget forecast will need to be prepared to see if the project makes since financially. It could be that a quality book of glossy photographs worth of the Alembic name will cost more per copy than you could reasonably charge. And add on to the cost per copy the amount per copy that will be allocated to the charitable purpose.
Someone will need to be in charge of the accounting, including the preparation of tax returns and financial statements.
Someone will need to be in charge of overseeing the publishing of the book, including collection of photos, layout, and dealing with the publisher.
Someone will need to be in charge of sales, including setting up for credit card sales and a web site for web based sales.
Someone will need to be in charge of shipping, including packaging, contact with shipping companies and international shipping.
And of course the project must have the blessings of Alembic. I would think that a book about Alembic instruments will reflect on the name and reputation of Alembic no matter the level of involvement of the company in the project. It probably wouldn't be too long before these things started showing up on Ebay.
That's enough for the moment.