1 - I like my oars right about mid boob level. Around the same area where you'd bench press or throw a solid jab if boxing. Torso size, leg length, arm length, height of seat, and oar tower height all play a part in getting oars set up comfortably for each individual. I like about a fists width of space between my oar handles when parallel.
2. I use webbing (not nylon) as my perimeter line with a loop strap & cam buckle to make it easy to tighten the line and remove it as needed.
"We are all visitors to this time, this place. We are just passing through. Our purpose here is to observe, to learn, to grow, to love....and then we return home."
Australian Aboriginal Proverb