Accommodation is cheap. 10 USA per night in budget areas. Daman Valley has double rooms, camping is possible. It's very hot. Hitching is easy. Lots of bird reports for Sabah on cloudbirder. I had 9 weeks. Loved it.
I didn't do a report but provided some info for a trip the next year. Check out Gareth Knass sul hal report on cloudbirders. I also visited Batanta for the Wilson's BOP, nothing has really been the same since! Wow!
I spent 9 weeks, mostly alone, in Sabah in 2010. using public transport and hitching. It was easy in every respect with great birding and mammals, etc.
itinerary was roughly, islands off KKB, poring hot springs area (5 days), sepilok area inc the new rainforest centre forest (5...
I did Sabah, borneo on my own (mostly) for 9 weeks in 2010, the distances are short between sites, accom cheap and national parks vast and varied. I lived comfortably on $30 usa per day. the wildlife and birding is spectacular. camping was tough due to the heat and rain so I mostly...
Might you consider volunteering abroad, I once spent 3 months working at long point bird obs in Canada, I received food and board in return. it was an amazing experience and I saw 200+ sp, most in full breeding plumage. Duties included 6 hr ringing per day (no license required), some data...
I had 8 weeks in Sulawesi & Halmahera last year, I did I mostly alone and on public transport, it was easy and safe. The locals were great and helpful.
I was quoted $1200 for 4 days on Halmahera, I did it alone, 8 days for $300!
painful reading for me, my sumatran trip (1995) was somewhat scuttled when my canoe sank at way kambas, bins/camera and canoe was always a bad idea! Only hearing schneider's was another major kick in the teeth - i will have to go back. Ta for the great report and inspiration.