Changing a model from sitting to standing - advice needed

[Cageyblood]

Hey all
I'm going to be doing some modification of the chaos lord / sorcerer lord models from the manticore kit for a new project. This means changing their poses so they stand up and don't straddle a saddle.
The models in question

My current plan is:
-snip out the legs
-remove the entire groin region
-drill holes into the torso and legs
-connect them with paperclip bits in the drilled holes
- adjust that to get the posing right
- greenstuff a new groin.

Does anyone have any tutorials they could point me to? Am I going about this the right way? If I am, do you have any advice?

 

[Cageyblood]

Well for anyone curious, I did the dang thing, just need to greenstuff the cut off bits in place. I think the pose turned out ok

 

[Nazqua]

Wow, Awesome work, glad you were able to get them standing

 

[Aginor]

Yep, looks pretty good.