Mansfield Park Dream Cast Part 2

It took me ages to decide who I would cast for Edmund, but I finally decided on:

Jamie Bell (Tintin; some other period drama but I'm not sure which. What do you think?)

For Mary Crawford:

Eliza Bennet (she looks kind of older than she is in this picture, she's 21. Probably younger than Kimberly Nixon, but I don't think it matters.)

For Henry Crawford:

Simon Woods (Cranford, Fake P&P)

For the young Bertram kids.....ummm

Young Edmund

Asa Butterfield (Boy in the Striped Pyjamas; Age 16)

Any ideas for the young Tom Bertram?

The young Maria and Julia: I have no idea!! Help Me!