Building a home organ - specification thoughts

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Hi all,

Last year I had the opportunity to pull an organ out of a church that was about to be demolished. I'm making steady progress towards getting it rebuilt in my music room.
The original spec of the organ is this:
Great

• 8' Open Diapason
• 8' Dulciana
• 8' Clarabella
• 4' Octave (called a gemshorn, but built like a principal)

Swell

• 8' Violin Diapason
• 8' Rhor Flute
• 4' Flute
• 8' Oboe

Pedal

• 16' Bourdon
• 8' Bass Flute

I'm wanting people's opinions on what I'm planning on doing, which is:

• Add a independent twelfth and fifteenth, to build up the principal chorus and to use electromagic to make a mixture
• Add some proper strings to the swell, such as an 8' Viol and a celeste
• Some sort of 16' trumpet for the pedal, extended to 8' for use on the great
• Extension of one of the flutes up to 2' for the Swell
• Making 12 pipes to extend the 8' open diapason down to 16' in the pedals (fortunately I have the room for this)
  

Using the various options this pipework will give me, I'm hoping for a final specification of:
Great

• 8' Open Diapason (A)
• 8' Dulciana
• 8' Clarabella
• 4' Octave
• 2 2/3' Twelfth (B)
• 2' fifteenth (C)
• Mixture - from B & C
• 8' Trumpet

Swell

• 16' Bourdon - from D
• 8' Violin Diapason
• 8' Rhor Flute
• 8' Viol
• 8' Celeste
• 4' Flute (E)
• 2' Piccolo - from E
• Maybe some mutation from B
• 8' Oboe

Pedal

• 16' Open Diapason 13-30 from A
• 16' Bourdon (D)
• 8' Bass Flute
• 16' Trumpet/something

In the long run I want to rebuild some of the chests as they're a mix of EP sliders + offset tubular pneumatics, but finding enough cheap electromagnets is difficult.