OK, first some web sites.
http://www.worldwar2aces.com/tiger-tank/
http://www.alanhamby.com/tiger.html
http://www.tigertank-h-e-181.com/
http://tiger1.info/
The german word "frühe" means early, so in other words its the early version we are talking about here.
The early version is identified by a number things. It has rubber rimed road wheels, the mid version also have rubber rimmed road wheels but it have different tracks and a different turret.
The tracks have three grooves instead of the raised cheverons on the late tracks.
It has feiffel aircleaners on the rear plate.
It has the drum shaped tall comanders copula with vision slits instead of the later version with periscopes.
Some of the very early versions, the so called initial version, had 2 pistol ports on the turret and no escape hatch.
Some early versions had smoke grenade dischargers mounted on the front sides of the turret.
The distinction between the early and mid versions is the turret. The new turret with the cast copula with seven periscopes were introduced in July 1943, there were a very few mid version that were fited with the feiffel aircleaners but because they had the new turret they are considered mid versions.
I don't have a chassis number for you for the first mid version, but it would be around 250350 + - 30 ...... yeah I know, a pretty wide spand but I haven't done the research.
Hope this helps
Edit : Yes it would be very correct to paint it panzer grey.