I echo Gamba's comments about the disposition and the console; in addition, some of the duplexed choices seem odd to me (why would you want a second open diapason on the Great Organ, especially if it's not scaled to match the remainder of the principal chorus?) My preference is for zero duplexing except on the Pedal, and if the Solo division is indeed conceived as a tonally distinct unit, I would keep it as such on the console. (It seems unusual to me to have a separate Solo division on such a small organ, but American organ-building has always mystified me.)
I think you are perfectly justified in wanting to have judicious borrowing. This is very common practice and there's nothing egregious here. One nice bonus with a floating solo division is that, even if you're pulling from pipes in other chambers, ultimately you can create a combined sound that those respective pipes couldn't otherwise offer in a standard configuration (think soloing out a line with the big principal, harmonic flute, and string which are divvied up in separate divisions). There's also nothing wrong with having more than one principal on the great. Just because a second diapason is there doesn't mean it will be used all the time. I highly doubt you'll be registering a Bach work with two diapasons in one division. Reger? sure, why not?
A few things have come to mind in regards to your proposed stop list:
• I would include a Gt/Ch manual transfer both for comfort and french romantic rep
• Salicionals II and Dulcianas II seem unusual for a great division. I guess it doesn't hurt to have the option since you're just borrowing from the Sw & Ch, but those did jump out to my eye as atypical.
• I'm very surprised you don't have the cor anglais in the solo division
• [This is atypical, but I'm a big fan of having a 2' flute in the pedal division, so you can put on some ethereal strings and then solo out the melody with your feet. Take it or leave it. I'd at least add one of the the 4' flutes.]
• are the concert flute in the Ch and the Major flute in the Solo the same thing? (if so, why the change in nomenclature?)
I wouldn’t shy away from judicious unification at all. It can make for a substantially more flexible instrument. Is it perfect? No. Is it more flexible and preferable to “straight” stop lists? Usually.
To participate in the discussions on Catholic church music, sign in or register as a forum member, The forum is a project of the Church Music Association of America.