Just a few pointers.... that aftermarket gas conversion will void any UL listing the gen set may have. That set will need around 200 CF of fuel, which may not flow through the small hose and cause the output to be limited. Last but not least, few people take the time to add up the fuel consumption of all appliances and see if their supply / meter are large enough. If you have gas heat and hot water, that will suck up the first 200 CF of the meter rating. (modest home) The gen set will need another 200 CF. (400+ total) The meter rating is on the tag.
They make bigger ones, I do not understand why they put a valve just before the quick connect, it is a source of restriction. The rubber gas line is for about 55,000 BTU.