Garage Wall

I've been wanting to build a garage wall, and i've been spending a bunch of time looking on this site for ideas that are doable in the space I have available. I've realized that it needs to be adjustable to have any longevity in keeping our interest. In the spirit of practicality I want something that can go from vertical (I have a 7 year old) to probably about 30 or so degrees (this would likely be good for myself and my 14 year old). My plan was to build a wall with an 8 foot x 16 inch kicker, a piano hinge, and then an upper section that is 8x9 feet. The 9 foot height is important because there are beams cutting across the garage and 9feet will still allow a hinged wall to clear everything. I could lower it all of the way to the floor and be able to replace t-nuts easily. Also, the risk of falling and whacking yourself on said beam will be nil. I could bolt on an extra foot and still be OK at less steep angles, so I have that in the back of my mind as well.

Here is the issue: My garage is build with a lower section that is fieldstone, followed by a section of concrete block, and then wood construction. It has a concrete floor that I should be able to bolt the kicker to, but there is no way to also attach the kicker to the fieldstone section. My thought was to basically create a Murphy Bed style framework that would be attached to the bolted down kicker, and then be attached to both the upper concrete block section and the wood section if necessary. I'd probably use a hand winch to change the angle with chains attached to the frame on both sides as well. Does anyone with structural experience have any comment on this plan? If I'm totally crazy for thinking this might be a good idea feel free to just say "don't do it."  Thanks!