I would like to have neighbour like yours !!!

Its not a kind of Enfield, ITS AN ENFIELD !!!
Lee Enfield No5 Mk1 but it is commonly called Enfield Jungle Carabine !!!
To be honest with you i'm not a purist and i have nothing against bubba riffles. ( when its well done )
But your rifle look to be in pristine condition.
If i was you ill keep it original...
This rifle worth at least 350-400$ if the bore is in gr8 shape.
If you want to make a *sportster*, buy one common enfield, you can have a nice one for around 150-175$
You can find tons of regular enfields...and not tons of Jungle carabine !!!
For the scope mount, there is some brands like ATI, they make good scope mounts and they don't require gunsmithing. Look at them before drill and cut the receiver !!!
But its your gun and your money