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?
"Eat your food as your medicines, otherwise you have to eat medicines as your food" Steve Jobs