Yeah that shouldn’t be too hard in principle. The problem is always finding the time to do everything isn’t it 
Definately. It is very much so based on the experience from andy’s airplanes and a couple of other projects, which is that even though a basic walkcycle is easy enough to do, having multiple characters perform different walkcycles, blending between them and changing their paths depending on direction, can be quite time consuming indeed.
To put the numbers on the table, I had to do a simple character test for a client recently where they just wanted to have him rigged and moving to show a client of theirs. They had an extremely tight deadline to get something together, so I used autorigger and walker together and after about 30 minutes of work and about the same amount of rendering it was all done. The character was walking along quite naturally and waving at the investors.
As far as professional work is concerned, Walker will pay for itself in a single job that has to do with walkcycles, or I will eat my bowler hat.
Not really, but I expect it to be relatively soonish. Fori has done some good work and I am sure that he is eager to share that with you. As am I with regards to the autorigger.
