We bought the lazy susan on the left online and cut a round piece of counter top to sit inside the turntable. We put a rod in the center to hold a webbing roll in place.
We spent big on the fabric meter in the center, but maybe a distance meter from the hardware store would have done the job for a tenth the price. It did come with a nice bracket though and is ISO certified. We cut some angle iron and spaced it with rollers from a tape dispenser to make a channel for the webbing. Someday we'll replace the gaffer's tap with something more permanent.
The hot knife on the right is constructed from a handpress, a heat cartridge, and machined blade and anvil. No thermostat on this simple machine, but we ran it through a timer (lower right in first photo) in case the operator forgets to turn the electricity off.
For cold cutting, a good sharp pair of scissors will work nicely.