Dinning & Hobby Table

I'm about to have bilateral knee replacement so I'm going about raising everything by at least 30cms.
This is the 30 year old lounge chair, once was a sofa bed, first up I removed pull out sofa bed and frame then made a heavy duty base using 75 x 75mm sleepers and whacked on a set of 150kg rated castors. I then made a inner support frame for the cushions to sit on.