Adam:

David Bohm (BohemianBicycles) has done gorgeuous S&S fittings with fancy drillings/designs for some of his customers.
That's icing on the cake, so to speak and costs only a 'few' $$ more . . . let's face it, we are the ones who want the tandem and design it to suit our needs/whims!
Would not worry too much about scraping a pedal in a turn unless you get into a racing/leaning way over mode. However, do be aware of some of these speed bumps/humps . . . we bashed a Phil Wood platform pedal (way back when!) into a speed bump when crossing over the Mexico/US border. We do pedal 90 degrees out-of-phase, somehing that would/could happen with ICS.
Don't worry about the lightweight younger stoker . . . powert-to-weight ratio comes into play and most kids are more adaptable than a lot of adulsts.
We can be philisophical about why we spend so much $$ on bikes/tandems, but ours is: 'It's an investment in our good health!'
Photo attached of the rest of our c/f Zona tandem.
Enjoy that new rideable work of art!