There's a big difference between scripting a train and scripting something the size of RTB. I mean, it's a noticeable difference.
I don't think size matters. (hue)
It's the number of different concepts the code spans.
If Kalphiter can make that gui he showed us, even if it's not as good as RTB's, and if he can do basic networking, like any chat would require, and he can handle blockland's server/client message system, as he did in his mining mod, etc. he should have all the required knowledge to make a mod.
Weather he has the attention span to finish (or start, huehuehue) it is something I would not be able to judge.