Here is a list of the modifications I've made to the kit; of course it doesn't means this is the "right way" to do it, is just "my way"
1 - Track tension tool in P.E.
2 - Lifting hook (all gray parts are from other Dragon kits)
3 - Rails and brackets thinned, adding brass triangles; drilling the fender where the side guides were.
4 - Drilling of the side spare links
5 - Clips of the flaps that close the vents
6 - Tool clamps made of brass sheet
7 - Tow cable made of annealed steel fishing line
8 - Wire copper handles
9 - Spare track links
10 - Tow cable supports made with copper wire
11 - Spare wheel bar clamp hollowed; need to add the chain and pin
12 - Need to make the hatches ..er...locks? (25)
13 - C hooks bracket in FG (21)
14 - Zimmerit made with Milliput y AFV Club or Modelkasten tools
15 - Copper wire chain
16 - Spare tracks (Tristar) and holders
17 - Spare tracks
18 - Spare tracks hold bar, made with brass sheet
19 - "Bosch lightyear" wire
20 - Copper wire springs
21 - Idem 13
22 - Idem 1
23 - Hatch stop in copper wire
24 - Lifting hooks
25 - Idem 12
26 - Copper wire chains and stretched sprue pin
27 - Towing cable chain
28 - Telephone wire hand holds
29 - Dragon Rommelkiste with plasticard brackets and Dragon nuts
30 - Schürzen doors in plasticard with locking bar in copper sheet
31 - Turret ring holder and nuts
32 - Upper part of each hinge on plasticard
33 - Telephone wire hand holds
34 - Cover for the hole where later the close defense weapon will be located
35 - Schürzen brackets thinned; bolts added
36 - Lifting hooks
37 - Screws on the turret roof (single holes, half covered with putty, a fudge)
38 - Copper wire ring
39 - Replaced gun muzzle
Cheers
Darío