Working with 2 strands held together.
Cast on 243 sts (provisional cast-on).
A row needs 4m of yarn.

Increasing every 6 rows (later: every 4 rounds).
At the end, a round will need 25m.

Needed 30g Soft Lamb and 35g Camellana for first part of back = 16cm (less than 1/6 of the overall amount needed because of the rows getting longer)

After 60 rows + 60 rounds:
Soft Lamb: 26,4g + 50,8g left.
Camellana: 93,7g left.
One rounds needs approx. 7,5g Soft Lamb and 8,6g Camellana at this point.

Further increases:
2x after 6 rounds
2 x after 5 rounds
6 x after 4 rounds
last increase in round 60+47
so 30 sts increased per side, 600 sts.
Start short rows for back neck then.

Approx. 10m of both Camellana and Soft Lamb left over, might have been sufficient for one round more, but not sure.