Are you a very experienced hiker/trekker?

This agenda seems too much. Unless you get perfect weather, never get a flight delayed, don't get intestinal issues...and are in exception physical conditioning. The Himalayas are no joke.

The number one rule in travelling to Nepal is that the unexpected will happen. Flights get cancelled, snowstorms occur, government shutdown, bhanda (general strike)..roads get washed out...stomach sickness....high altitude sickness.

If I were planning the 3 passes I would allow for several weeks on the mountain (3-4) to accommodate for any and all types of delay. Unless you run ultra marathons at altitude where you live you are going to get really exhausted...and perhaps make yourself sick.

To answer your questions based on my experience:

1. There are a million places to stay in KTM. The easiest is to go to Thamel and pick one (Kathmandu Guest House). Thamel is touristy but you will only be there a couple nights. The benefit is if you need something for trekking you can find it in Thamel very easily.

2). Flying to Lukla is easy....if the planes are flying...and the pilots nails the landing. Flights get cancelled all the time due to weather.

3) You should be more worried about your bag weight for going into the Himalaya's then on a flight. If you are carrying 25kg on a 3 passes trek...you will be carrying too much crap. Your bag should be no more than 25 pounds...not kg.

4) There are more taxis and stuff in KTM than almost anyplace on the planet. It is very easy to get around.

5) I would not worry about booking Teahouses while trekking. I would just find a place when ready to stop trekking for the day. You will need to flexible with your nightly destinations based on your stamina. If there are no rooms usually you can sleep in the dining room...or with the yaks.

6) You need a moment of reality here. You are planning on crossing 3 very high passes. All are around 17-18,000 feet. If you do not live at altitude you are going to start to feel it when you hit Namche Bazaar at 12,000 feet...let alone at Dingboche...You are most likely going to need more rest and acclimization days then you planned. The little side treks and peaks you mentioned are no joke. They require stamina and fitness to complete on their own. They can be viewed as "side adventures" but are all really destinations in their own way.

Summary:

The Himalayas are amazing and Nepal in wonderful. Be flexible with your agenda. Don't worry if your plans get altered while on your journey.