Its hard to tell how big these rocks are as there is nothing for scale. I have a feeling they are very BIG and one person would struggle to pick one up? 
If they are as big as I think they are, you could build a mini Stonehenge circle somewhere on the plot then charge people for coming to see it!
PS Are there any 'Henges' on Mull?

If they are as big as I think they are, you could build a mini Stonehenge circle somewhere on the plot then charge people for coming to see it!

PS Are there any 'Henges' on Mull?
"I'd rather be the oldest in the gym rather than the youngest in the nursing home"