Yes, I just assembled all those figures for my next project... I can post a picture tomorrow if you like.
I got Black Tree (ebor), footsore and GBeast (plastic/metal), they fit weel IMHO
More, Blacktree miniatures are often on sales and shipping is cheap, I bought saxons, vikings and WW2 in the last 18 months.
Roman artillery is nice but the artillerists are in "lorica segmentata" non suitable for late period, you can easily swap them with other dark age miniatures just change the heads.
Ciao