What kind of accessories do you have in mind, functional or detail? If you buy, it won't be cheap, but the HL Pershing is 1:16 scale like the expensive Tamiyas, so you can buy sprues of parts to add to the tank. You can also make your own added details by using wire to replace the thin plastic handles on the hatches, rolls of green cloth for bed rolls etc. There are 1:18 scale figures from Ultimate Soldier that work nicely to add realism to the tank, since they are very detailed.

If it is durability that you want, there are metal tracks available on-line, metal gears to replace the plastic stock gears, and metal drive wheels, as well.

Check out a few of these sites:

http://www.badcataviation.com/acfi1scby21c.html

This company will sell almost any part for the tanks that they sell....
http://search.ebay.com/_W0QQfrppZ25Q...otoysQ2dcanada

http://www.build-a-rama.com/catalog_1_18.shtml

http://www.tamiyausa.com/search.php?q=56016

Good Luck!

Jason