This is the Sandblaster I made using an old water heater tank (about 30Lt and wall mount type) the only modification need to the tank apart from the welding of the wheels , leg and handle was a 4mm stee plate cutting with a cylindrical part with thread welded at the cencter for adding the sand as you can see on the photos !
The reason i made a sandblaster is because it cost me about 100 euros where as if i bought one i would have cost me about 400 euros !!! So buying one was not an option
If their are any questions or i didn't give a detail enough explaination please ask !
Here is a video woth some more detail to it :