I wouldn't, the heat from the fire will just crumble anything made from a concrete base. We have blocks around ours, we've had to replace some of them cause fire got so hot and they fell apart.
I finished getting the cub running on Friday evening. I got off work very early so I mowed at church for over 2 hours, got a nice sunburn.
Worked at the rental house pulling weeds and mulching Saturday. Monday, went with a buddy to another guy we know, he was cleaning out his garage. We split it up, but got a Sears Suburban 18/6 rolling frame with brand nw ATV mud tire all around, 2 hoods/grills, 2 -18 Hp Onans, a vertical shaft 20 HP Briggs opposed twin, Kohler 14 HP vertical, several other small motors, tons of suburban parts, Sears 3 pt hitch , etc all for $300. I have to go back this week and pick up all his scrap metal and fab parts he doesn't want.