Hi Hisham;
I not too long ago purchased one of the early Ural turret set from SBS, it is made for the Tamiya kit and is a one piece casting in resin. Its cast in a Blue resin and is Hollow and is very thin, its quite nice with fine details and was easy too adapt too the Tamiya kit.
SBS also makes a more complete kit of the T-72 that I think you mite want too look into, it has the early hull without the added front armor casted on the Glassis Plate.
Altho you have too cut away the front upper part of the Tamiya Hull, but its a more expensive conversion that you may not want too undertake. The turret that comes with this conversion set is the one I think that gives you the T-72 that you want too build, other than miniarm turrets which are quite costly.
The JS, and Blast turrets are cast in resin and are not Hollow which makes them very Heavy altho they are very accurate size wise and have great details.
I Hope this Lil-bit of info, Helps you in your Project !
GOOD LUCK; MIKE.