Budget

Accomodation: 200 bt a night
Bangkok - 4 x2=8
chiang mai- 4 x7=27
Pai - 4x4=16

Laos accomodation:
Vientienne- 4x3=12
vang vieng- 3x4=12
luang prabang- 6x4=24
muang sing- 5x2=10

Vietnam
Hanoi-7x4=28
Hoi an- 7x3=21
Dalat- 6x6=36
hcmc- 6x3=18
mui ne- 6x4=24

Cambodia
phnom penh- 5x3=15
siem reap- 4x3=12
ratanikiri- 5x6=30

Accomodation costs roughly 340 or 170 each.

Extras SE asia
gibbon experience- 240
cookery course- 40
yoga classes- 24
angkor- 50
Halong bay tour-22
diving nha trang-90

about 500 euro in extra activities or 250 each

Transport
Flight Vientianne- Hanoi 150
bus from bangkok- kanchaburi 62B
Kanchaburi-chiang mai ??
Chiang mai-pai 60B
Pai-Mae Hong son- 60B
Mae hong Son- chiang Kong- ??
Chiang Kong-Huay Xai 40B
Huay Xai-Lam Na Tha 5E
Luang Nam Tha- Luang Prabang ??
Luang Prabang-Vang vieng- 4E
Vang vieng- Vientienne 2E

Hanoi-hoi an ??
hoi an- nha trang 7E
Nha Trang-Dalat ??
Dalat- Mui Ne??
Mui Ne-HCMC 4.50E

HCMC-Chau Doc-Phnom Penh 9E
PP-Ratanikiri ??
Ratanikiri-siem Reap ??
Siem Reap- Bangkok 5E

around 300 for transport, each.

So budgeted about 750 for accomodation, transport, and extras (each)
550 for food, shopping and miscellaneous. is this enough??