Entity instanced sub-metatables

[Pyro-Fire]

How might one make a metatable for something like the entity metatable that automatically creates its own instances?

Sample Code:
[lua]
local testClass = {}
function testClass.MyFunc(t,x,y,z) print( "MyFunc() Call:",t,x,y,z ) end

local testMeta = {}
function testMeta.__index(t,k,...)
print("Meta Index:",t,k,...)
return testClass[k]
end
function testMeta.__call(t,...)
print("Meta Call:",t,...)
end

local ENTITY = FindMetaTable("Entity")
ENTITY.Test = setmetatable({},testMeta)

-- Test Entities
-- ents.Create() or player:GetEyeTrace().Entity
local e1 = testEnt1
local e2 = testEnt2

print( "e1:", e1.Test, "\ne2:", e2.Test )
-- e1: table 0x00ff
-- e2: table 0x00ff

e1:Test("cats")
-- Meta Call: -- table 0x00ff -- Entity( e1 ) -- "cats" --

e2:Test("dogs")
-- Meta Call: -- table 0x00ff -- Entity( e2 ) -- "dogs" --

e1.Test:MyFunc("cats")
-- Meta Index: -- table 0xffff -- "MyFunc" --
-- MyFunc() Call: -- table 0x01ff -- "cats" -- nil -- nil --

e2.Test:MyFunc("dogs")
-- Meta Index: -- table 0xffff -- "MyFunc" --
-- MyFunc() Call: -- table 0x01ff -- "dogs" -- nil -- nil --

e1.Test.x = "cheese"
print( e2.Test.x )
-- "cheese"
[/lua]

The desired outcome is as follows;

[lua]
local ENTITY = FindMetaTable("Entity")
ENTITY.Test = ???

print( "e1:", e1.Test, "\ne2:", e2.Test )
-- e1: table 0x01ff
-- e2: table 0x02ff

e1:Test("cats")
-- Meta Call: -- table 0x01ff -- Entity( e1 ) -- "cats" --

e2:Test("dogs")
-- Meta Call: -- table 0x02ff -- Entity( e2 ) -- "dogs" --

e1.Test:MyFunc("cats")
-- MyFunc() Call: -- table 0x01ff -- "cats" -- nil -- nil --

e2.Test:MyFunc("dogs")
-- MyFunc() Call: -- table 0x02ff -- "dogs" -- nil -- nil --

e1.Test.x = "cheese"
print( "e1:", e1.Test.x, "\ne2:", e2.Test.x )
-- e1: "cheese"
-- e2: nil
[/lua]

This is my current solution:

[lua]
function testMeta.__call(t,x,...)
if( !x ) then return t end
print( "Meta Call:",t,x,... )
end

local function newTestClass(e)
e._Test = setmetatable({},testMeta)
return e._Test
end

local ENTITY = FindMetaTable("Entity")
ENTITY.Test = function(e,...)
return (e._Test or newTestClass(e))(...)
end
[/lua]

However it results in this outcome which is a little different to what i'm aiming for.

[lua]
local ENTITY = FindMetaTable("Entity")
ENTITY.Test = ???

print( "e1:", e1.Test, "\ne2:", e2.Test )
-- e1: function 0x00ff
-- e2: function 0x00ff

e1:Test("cats")
-- Meta Call: -- table 0x01ff -- Entity( e1 ) -- "cats" --

e2:Test("dogs")
-- Meta Call: -- table 0x02ff -- Entity( e2 ) -- "dogs" --

e1:Test():MyFunc("cats")
-- MyFunc() Call: -- table 0x01ff -- "cats" -- nil -- nil --

e2:Test():MyFunc("dogs")
-- MyFunc() Call: -- table 0x02ff -- "dogs" -- nil -- nil --

e1:Test().x = "cheese"
print( "e1:", e1:Test().x, "\ne2:", e2:Test()x )
-- e1: "cheese"
-- e2: nil
[/lua]

Any suggestions or ideas?