Hakone-Five Lakes tour

Hi, everyone!
While making a plan for my journey I came across some difficulties, and so I have a couple of questions)

Here is the plan:
Tokyo --- Odawara --- Hakone Yumoto --- Moto-Hakone (by bus) --- Togendai (by Hakone Sightseeing Boat) --- Owakudani (by Hakone Ropeway) --- Sounzan (~) --- Gora (by cablecar) --- Sengoku (by bus) --- Gotemba (bus) --- Kawaguchiko (bus) --- Otsuki (Fujikyu Railway Line) --- Tokyo (JR Chuo Line)

And here are the questions:
1) According to the info I found, all kinds of transport between Odawara and Gotemba are covered by Hakone Pass - is that right?
2) Is there really a bus connection between Gora and Sengoku (shown not in all maps)? How long does it take and how much does it cost?
3) Which of the above is additionally covered by Fuji Hakone Pass? Is it worth buying? Does it cover buses in Kawaguchiko area, either retro or regular?
4) Is there any website where one can find timetables and fares of all buses, like hyperdia for trains?

Would appreciate your help))

According to the info I found, all kinds of transport between Odawara and Gotemba are covered by Hakone Pass - is that right?

Yes. And if you were to take Odakyu between Shinjuku and Odawara and the Fujikyu/Keio bus between Kawaguchiko and Shinjuku, then everything would be covered by the Fuji Hakone Pass:
http://www.japan-guide.com/e/e2358_014.html

Is there really a bus connection between Gora and Sengoku (shown not in all maps)?

Yes, here are the departure times:
http://www.hakone-tozanbus.co.jp/pdf/13505-003001.pdf

How long does it take and how much does it cost?

20 minutes and 410 yen, but it is also covered by the Hakone Freepass and Fuji Hakone Pass.

3) Which of the above is additionally covered by Fuji Hakone Pass?

As explained above.

Is it worth buying?

If you don't have a Japan Rail Pass, I think it will be worth it.

Does it cover buses in Kawaguchiko area, either retro or regular?

It does not cover the retro buses. I don't think it covers anything besides the Gotemba-Kawaguchiko line.

4) Is there any website where one can find timetables and fares of all buses, like hyperdia for trains?

No. For Hakone in Japanese:
http://www.hakone-tozanbus.co.jp/map/hakone_index.html

For Fuji Five Lakes partially in English:
http://transportation.fujikyu.co.jp/english/gettingaround/index.html

Fuji Five Lakes in Japanese:
http://bus.fujikyu.co.jp/line/index.html

Thank you so much)