Thank you again for all your kind comments I really appreciate them, it actually took me just over a year to get to this stage.
As to size I thought very carefully about this. I wanted to be able to get the three porches down the sides so that it looked like the Meduseld from the films. But, at the same time I did not want it to be so big it was impractical to use on a gaming table.
In the end I went for a model where the hall was around 400mm long by 275mm wide. with the mound 700mm by 525mm. This size enabled me to still be able to fit 28mm LOTR figures on and in it without it looking out of scale.