To be honest, I doubt if you will ever get very much in the way of modelling content in E Book format in the near future. Current modelling publications, whether books or magazines, rely very heavily upon colour illustrations and diagrams. Current E Book readers use E Ink and cannot reproduce colour which is obviously a big drawback! More pertinently, the large proportion of graphic content makes it time consuming and expensive to reformat the material for use on E books as magazines and hard copy books come in different shapes and sizes. The cost of doing this compared with the potential market would rule this out as a commercial proposition in most cases.
You can of course see everything in colour on screen if you subscribe to Model Boats, whether to the magazine itself or the digital editions, as these are simly reproductions of the published pages. The ability to see everything in the digital archives back to 2007 is also a tremendous bonus.
Sample articles can be viewed from the home page of this website and by using the Features link above and many of these are free to view. The covers and contents of all recent issues are also published as a separate section under the Features tab above and you can usually order back issues of any particular copies that interest you.
If you are simply interested in free material then the online model boating forums are the obvious place to go but you will often need to do a bit of work to track down the exact information you need. It is normally expected that new members will do a bit of homework browsing the forum to see what is there before asking general questions, many of which will have already been asked and answered previously.
Colin