There is no doubt that there is useful storeage space under the front cowel, and I've been looking at mine working out how to maximise it, and feel that a small gel battery against the left hand side bulkhead would help a lot,and be easy to do, then there is the option of moving the oil tank back in front of the fusebox against the centre of the bulkhead. This would open up a potentialy huge space [relatively speaking of course]. The only thing to be aware of then, is that the steering column is unsheathed, and could get caught up on something and that is the last thing you would want.
If your WW1 box isn't too expensive go ahead and get it Charlie, but I bet you that when you get the car, you'll have other and better ideas on how to utilize space. Sorry if I'm taking some of the forward planning and anticipation out of the game.