Interesting idea - I might add a walk-though to go though the components that feature to explain their role and importance
Now this next part may be a bit contentious .... I don't really want to supply the client who literally knows nothing but still wants to do a self-install.
You can go to a certain point when it comes to having ready-made kits for plug and play but when you get certain questions it is time to say "seek a professional to do the install". Shadow them to learn and ask questions but there is only so much you can do remotely and via email/telephone.
I think of it as IKEA .... you get a kit, you get instructions, but if you cannot work out how to put a flat-pack together then you need someone to do it for you, not just more information to read.
I don't think (I hope not) that anyone is going into doing a self-build without having tackled ANYTHING previously. It is too big a project to make it the first time to pick up a screwdriver!
What are your concerns about supplying 'know nothing' clients? Yes, advise pro install but many can't afford it and they will do it themselves wherever they get their advice which could include FB, at least you can be confident your advice is safe.
After further consideration maybe consider doing an intermediate and advanced diagram/walk thru set up as well. Beginners will click on the intermediate set up and think 'oh, I like that gadget, that's cool' and click on Advanced and immediately click the back button!!!
A very simple pro n cons of battery types, again in layman talk would be valuable.
Too many sites think that smothering their most accessible pages in NASA standard kit makes them look all professional and up to date, most punters dont want to be able to check their sine wave (or whatever the advanced stuff does) while out for a walk. As soon as a novice reads two paragraphs in a row that they do not understand many will leave the site. If they are not your target audience you also now know how to get rid of them!!