Yes this is the name of the expansion that will be put online in a few days and that will cover the 17th Century.
It will be a draft that will develop with your help. Any feed-back is welcome.

The first difference will be the basing.

these are the basing requirements for 15mm

All troops have a 12cm frontage. Depth is not so important and what follows is just a suggestion:
ECW-TYW P&M: 4cm
Tercios: 12cm
Skirmishers and Late ‘600 P&M: 3cm
Irregular foot (eg highlanders): 5 or 6cm
Gallopers, Trotters and Siphais: 6cm
Late ‘600 Cavalry: 3-4cm
Reiters: 8-10cm (we suggest to form 2 columns)
Dragoons: 4cm or 8cm (if horse holders are depicted)

for 28mm we are thinking of a 18cm frontage and half that size for 6 and 10mm (=9cm, this would be compatible with POW system). For latter scales an option could be to keep the 6cm frontage.

Any opinion is welcome.

I think a base widht of 6cm work fine for 6-10 mm miniatures, also to don't fill up her by miniatures.
Instead i propose 4 cm base widht for 2mm blocks.