I have never used a lung rake. I just push the lung toward the spine and they pop right out.
removing the kidneys is much harder.
Sometimes they do pop right out, kind of amazing when they do-but I'm a bit of an anatomy nerd, others times not so much. I just wait to clean anything remaining in the back during final cleaning and cut up in the kitchen.
No need for a plucker as I only do 4 birds at time due to space and stamina,
am only culling a few older layers, not processing a couple dozen meat birds.
Tho I'd love to have one,
build one, as they are such a cool 'machine'.
But no real need, no place to store it, and just another thing to clean...my slaughter setup is not out in the yard with a hose running. I do have one rather clever innovation that
really helps with plucking, see pic below.
Tried skinning a year old cockerel once, it was a bear and I ended up just going far enough to get breast, thighs, and upper wings. That was my very first slaughter 5 years ago. Was going to try to preserve saddles and hackles, and avoid plucking as I didn't even have scalder equipment then, but discovered he was covered in lice(long story there),
that was huge learning curve day.
These I scalded, plucked all but the pins, and skinned as I cut them up....worked pretty good, legs and breasts were easy with a few snips, couple tough spots, and I just tossed most the wings. Another learning curve, making the best of a stupid situation created by my own sloth. Will be curious to see how they stew up, how much flavor might be lost due to the missing skin.