My favorite mod for SX-70 cameras, a conversion for I-Type film with an internal rechargeable battery. This way I can use all the varieties of integral film available (I-Type and 600). :
Mint Camera SLR670-X ZERO Instant Camera SLR670-X ZERO B&H Photo
SONAR OneStep & SX-70 polariod film - YouTube
About Polaroid SX-70: 5 Unconventional Truths Nobody Is Telling You
Vintage Polaroid Onestep SX-70 White Rainbow Stripe Instant - Etsy
Working Polaroid SX-70 ALPHA 1 w/ leather strap tested w / battery pack #910 | eBay
A look inside the chips that powered the landmark Polaroid SX-70 instant camera