Beware, we like ours games likewise, but no testing was done for "BBDBA" or "DBA 24", we arent sure about the impact of changes about game lenght with more elements.
Thanks for any comment/analysis - or even better, playtesting - and honest opinion.
Please forgive the approximations, we're not english speakers.
I'm a relatively fresh player of DBA, D3H2 & HotT and tried them also with my sons. My advice: keep it simple!
For I found that the key to a good game is reduction, not necessarily of rules but especially of unit types used in gameplay.
So maybe you should even stick to either DBA OR HotT, because D3H2 players are easily tempted to use too many different unit types (e.g. bows AND shooters). It's better you keep your armies simple. Try to use not more than 4 different unit types.
Another essential point are good player aids. Let's be honest, the purple book is no good if you want to check any rule fast (but stevies comprehensive index is a big help, that's why I even bound it into my rulebook) and the style is...well you know.
Therefore try such aids as the twopage rules chart of the society of ancients or the Hott cards pdf (files section, HotT, boardgamegeek.com, I think). I love these cards, because in this way you need not more than about half a dozen small cards containing ALL necessary rules!
And last but not least: If you find yourselves stuck in any dubious game situation and you can't solve it quickly: don't be pedantic. Try to solve it your way, maybe by throwing some dice?
So have a lot of fun battles! Cheers,
P.S. I find your DBOTT house rules very nice and interesting. Thanks for sharing! B.