Thank you for your advice.
Post my last update here, I have further revised my itinerary (though still in the works !:)... Below is a guide of the itinerary:
Thursday 31/8/17 Paris to Lucerne via Basel
Friday 1/9/2017 Lucerne - Engelberg (single) (BASE in Lucerne)
Engelberg - Titlis (single)
Titlus - walk the suspension bridge (free?)
Titlus - Pilatus (single)
Pilatus - Lucerne (single)
(I will do some short hikes in between stops etc, but have not decided which routes)
Saturday 2/9/2017 Rigi Majestic Round Trip (Lucerne) ( does this require a full day? If not maybe I can depart for Interlaken later in the day?)
Sunday 3/9/2017 Lucerne - Interlaken Ost via Golden Pass (single) BASE Interlaken
Monday 4/9/2017 Interlaken Ost - Wengen (single)
Wengen - Jungfraujoch - Grindelwald (single)
Grindelwald - Interlaken Ost (single)
Thursday 7/9/2017 Interlaken Ost - Zermatt (return)
Zermatt to Matterhorn (return)
Friday 8/9/17 Interlaken Ost - Zurich via Lucerne?
1. Can you please advise if the above is practical and doable?
2. I believe from Interlaken, I can travel by train to Zermatt for a day trip? Is this correct? I want to see the Matterhorn :). How do I do this? I tried reading some post, but got rather confused. Is it a direct train ride, how long is it? I believe some hiking is required or take cable/train?
3. I will be departing from Zurich airport back to Singapore on Sat evening (9th Sept). If I can do a day trip #2 above, then on Friday I can basically head to Zurich from Interlaken (would that be right?) And I will stay in Zurich for one and half days. I want to cover these two regions and have read and informed by friends/ppl from this post that both should not be missed.
Thank you again for all your help thus far, there's still alot to work out such as timetable for trains/connections etc, however as I'm covering quite alot of grounds, I believe the Swiss Travel Pass will be most appropriate. Any other tips and guidance is greatly appreciated.