,there is no kit available for the much needed BME, BEX But this may change soon as I need a lot of these also.
As you were hinting perhaps, there is now a kit for the BME available. I bought two of them over the weekend at the Ipswich Railway Workshops Museum model train show. The manufacturer is Peter Boorman, who does N scale predominantly, but this venture into HO appears to be well worth his effort. I am still to build the kits, but they look promising.
$55 each so not cheap, but they appear to be well detailed. This URL is most likely in our links, but to save you the search http://peterboormansworkshop.com.au/
PS. I bought mine from Al Cutmore on the AR Kits stand before I realized Peter Boorman was also at the show. So if you can't get the kits from PBW, you can try AR Kits.