Is MultiSite the best option?

I originally thought this was the best way for me to go, but now I am not certain it is. Ill explain what I am looking for and would love to here your input. I want to build a network or even a percieved network (open to the idea of one site) Where each “page” needs to appear or be a home page and have its own posts. Where each “Page” can be promoted alone. I do still want the all of the “pages/sites” to remain related/connected but NOT allow navigation between them (directly) There will be no real reason to do so either, but I want the “main site” to gain authority from the growth of the secondary pages. I also want to be able to share posts, Ill explain below.

http://www.mainsite-com Shows all posts in the “network”
http://www.mainsite-com/Widgets/ posts for this and all below
http://www.mainsite-com/large-widgets/ posts for this and 3 below
http://www.mainsite-com/Large-Red-Widgets/ posts for this and both below
http://www.mainsite-com/Large-Square-Red-Widgets/ posts for this and below
http://www.mainsite-com/Free-Large-Square-Widgets/ only posts for this

Whats my best option?
thanks