How do you go about the modelling process for things like the buggies/kopter, do you sketch them up first?
Oh no, no sketch, only instinkt, like Orks think.
is it mostly spares from other models?
I used bitz and pieces of other models, that friends gave to me.
How much Green stuff do you use (if any)?
No stuff, I'm a very-very-very bad sculptor.
and great tutorial for the orks, but how do you paint that blue on the tyranid parts?
Thank you ! For the tyranid part, well, I have some magic glazes.
On black undercoat, a brush of Fenris grey, a brush of Space wolf grey and a brush of skull white. When dry, an application of old Citadel Blue Glaze for chitin, and purple glaze for tyranid skin. And a brown juice finally.