Well, I tried to follow the "middle ground" as one might put it... hopefully the sizes are fine for both 1e and 2e - although, the dragons as they are now (as in the icons) are huge compared to other similar-leveled creatures (as in XP) (so I am guessing that Gary Gygax may not have intended for the tails to be excluded from the sizes given).
If that is true, we could always set the large dragons as the "very old" or "ancient" versions (as the 2e sizes for the older sizes are just ridiculously huge).
If we set the current sizes as the "oldest" versions, we could also have somewhat doable Bahamut/Sardior/Tiamat icons, if we follow suit
