rctank.de has some good Pershing stuff.
http://www.rctank.de/24-GHz-US-M26-P...Metal-sprocket
http://www.rctank.de/M26-PERSHING-/-SNOW-LEOPARD
I would definitely get the 4:1 PRO steel gearboxes for the Pershing.
Tankarmy also has the metal shocks, and their international shipping isn't terrible.
http://tankarmy.com/heng-long-tank/i...khpq47nqdj77q5
Although I haven't modded a Super Pershing, yet, it's not too difficult. The basics are, a longer gun, spaced armor on the glacis and mantlet, stabilizer springs on the turret roof, trim the sand skirts, two piece loaders hatch, ballast box on the turret bustle, and the big one... T81 tracks. (kind of a long list now that I type it out lol) IMPACT are the only ones I've found that make the T81. The sprockets are made for Tamiya drive shafts, so they (or your HL drive shafts) will need to be modified to fit.
http://mitosal.com/M26Pershing.html
http://mitosal.com/1011.htm
There are several guys on this Forum who have built one (or many
), so you should be able to find them. Eddyk just did these:
http://www.rcuniverse.com/forum/rc-t...g-ibu2pro.html
http://www.rcuniverse.com/forum/rc-t...ng-v2-0-a.html
There are also some more guys on
http://www.rctankwarfare.co.uk that have built them too.