4 hands piano pieces book

[Alberto Simões]

Hi

I imagine this is a recurring question. Well, at least I remember doing 
a similar question about ten years ago.

I am asking again because things change, and I expect to be some better 
approaches to what I need.

I want to prepare a small book of small 4 hands piece. This mean that I need
 - the left page to be used for the Primo and the right page for Secondo
 - page breaks in the same measure
 - the ability to have more than one piece per page (for example, one 
small piece taking half the page, another bigger, starting at the same 
page).

What would be your recommendation for this?

Thank you
Alberto