I want to point something out in your first pic. I would strongly recommend never to use cinder blocks!!! They are very dangerous and can crumble at anytime. Try to find some solid wood blocks and place a piece of steel between the legs and wood (so the legs don't sink into the wood). I don't want to see anyone get hurt.
![Attention!! :attention:](https://board.marlincrawler.com/Smileys/marlin/attention.gif)