Nice red, CCG. How are you planning on holding the battery in place so that it doesn't rattle around, or does the slope of the pickup wedge it in?
I persuaded a friend of mine to get a real Clapton Strat (well, it was the best non-custom shop Strat in the shop and only double his initial budget). I was impressed by the mid boost (well its a mid+bass boost) but it did help to have the TBX tone control in there as well to add some extra treble in when using the mid-boost as the overall sound does become darker with it turned up. Of course on full boost you are then reliant on the amp overdriving and adding in some high frequencies to compensate, but a slight boost thickens up the sound without overdriving, which is where the TBX is usefull.
The TBX is basically two stacked pots, one 250k, one 1meg, wired so that below 5.5 on the knob (where the centre detent is), you are working with the normal 250k (or less) tone pot resistance, but above that, the resistance rises to 1 meg, so that very little high-end is being taken away, so you get a brighter sound than normal. As the extra brightness isn't huge, so you normally wind the pot up to 10 if not at 5.5, you could use a no-load pot to get a similar result when set to 10, or a switched pot to add in an extra resistance in series with the pot, for a similar effect.