bondage chair

[lugnuts]

I'm thinking of making myself a bondage chair. It's a flexible lay-down/sit-down thingy.

I'll upholster it with pleather over padding

I'm wondering about the padding. Unlike a normal piece of furniture, it matters how much the cushion gives. So I need something comfortable but that will keep body parts from moving about too much.

Anybody built anything like this?

What's recommended for the cushion material?

I'm thinking about those rubber sectional gym mats, the interlocking kind. Maybe 2 layers.

advice wanted.