I do that to all Lima B4s
Those windows are effective.
I am not too bothered about the shortness as it is only a couple of mm and TBH I need to work out where I would insert it. But I may have ago for any more as I can use the same technique as I used for the BSO.
2 and 2a I am using mainly Hornby with some Bachmann, I will need a few sets so not too bothered about mixing.
They are starting to increase in value now, this does surprise me, but am I denying collectors to increase my Mark2 collection?
I am currently on the hunt for a few more Airfix 2Ds as I have run out of FOs, 1 is WR FK another WR or MR 2F and the other will become a BKF.
I need another to go with E1883 as well as another 47, I have enough TSOs for now, I bought 8 new a LONG time ago.