Yes that is the upper RFI shield. DO NOT remove it, unless you intend to run the 128K for extended periods of time. I say this because it is in original stock condition and should be left that way ... Unless you really intend to use it the way it would have been in 1984 - in which case, definitely remove it as it may cause the Mac to overheat. Running for short periods of time to demonstrate for friends, or amuse yourself every few days, won't cause any serious problems, especially if you have upgraded the components.
JDW refers to upgrading the analogue board to mean bringing the component specs up to final Mac Plus standards. Since 1984 board components are not reliable, unless you are retiring the board to preserve it for posterity, you should replace them with the best available today. This will reduce the amount of time you will spend replacing components down the road. In reality, finding an original 128K board that has all of it's original stock components from the factory is almost impossible. If you do, then I would retire the board to preserve it exactly as it came off the factory floor. However, this is not likely the case, and numerous components will have been replaced over the 128K's life, and depending on when, with more robust components specified later during the M0001 lifespan.
Most Mac enthusiast will perform an entire board re-cap to prevent any potential problems from cropping up which could risk bringing down other board components.
The lower RFI shield sits under the logic board and fits over the ports. The early ones did not extend very far under the logic board and was metal on both sides. this could sometimes cause shorts, so that Apple eventually coated the inside with plastic, and eventually extended the shield e entire length of the logic board.
And no, that is not the 22AWG wire harness. J4-J7 is the logic board connector. Most likely considering that you have the upper RFI shield, you also have the 22AWG thin wires.
JDW refers to upgrading the analogue board to mean bringing the component specs up to final Mac Plus standards. Since 1984 board components are not reliable, unless you are retiring the board to preserve it for posterity, you should replace them with the best available today. This will reduce the amount of time you will spend replacing components down the road. In reality, finding an original 128K board that has all of it's original stock components from the factory is almost impossible. If you do, then I would retire the board to preserve it exactly as it came off the factory floor. However, this is not likely the case, and numerous components will have been replaced over the 128K's life, and depending on when, with more robust components specified later during the M0001 lifespan.
Most Mac enthusiast will perform an entire board re-cap to prevent any potential problems from cropping up which could risk bringing down other board components.
The lower RFI shield sits under the logic board and fits over the ports. The early ones did not extend very far under the logic board and was metal on both sides. this could sometimes cause shorts, so that Apple eventually coated the inside with plastic, and eventually extended the shield e entire length of the logic board.
And no, that is not the 22AWG wire harness. J4-J7 is the logic board connector. Most likely considering that you have the upper RFI shield, you also have the 22AWG thin wires.