Hang on...you are running a plastic tube to a kettle on your stovetop?? There is zero chance that the water getting to the device is anywhere near the right temperature after going through a length of plastic tubing. As you know, temperature, pressure and grind are the three ingredients that make good espresso. This throws temperature control out the window and would make the temperature wildly swing depending upon the speed and volume of the extraction. Warm up time is crazy too, as you have to boil a pot of water. Most machines take around 30-40 seconds, but Breville has really perfected this and their new machines come up to temp in a miraculous 3 seconds.
Besides that, anyone who has used an espresso machine knows that there's quite a bit of resistance when locking in a portafilter so that it seals properly. This thing looks like it would move off your countertop before the portafilter would lock in. Do you have to hold the legs with one hand while you lock the portafilter or something?
This is the main issue with those hand pull machines that don't have a boiler. It's so so fussy getting the temperature right, you have to warm everything up first then it's a race against time and even then you never really controlled the temps.
Besides that, anyone who has used an espresso machine knows that there's quite a bit of resistance when locking in a portafilter so that it seals properly. This thing looks like it would move off your countertop before the portafilter would lock in. Do you have to hold the legs with one hand while you lock the portafilter or something?