This sounds like similar construction to the BULLFROGS. All plastic. They are tough heavy,and the owners love them. The toughness allows the owner to beach the boat without worrying about our sharp rocks and barnacles ripping holes. Scratches yes but unless really stupidly operated the boats withstand far more abuse than any inflatable.
Of course if you nail a rock at speed nothing is damage proof.
I would think fendering off from the big boat will be neccesary.
Not for everyone and you must look at the pros and cons. There will be cons.
I simply googled Roplene last night and came up with a bunch of info including the owners assoc. Try it for more info.
If the price is right and you can live with the cons I personally think it would be a good candidate but note I've never seen one.
Although I've not seen one I have welded plastics like this, and been around others who are good at it. Repairs should be possible with the right plastics, welders, and equipment. I think though for this the hot air should be inert, nitrogen or argon, as just hot air may degrade the joint. You want a high quality weld, not just stuck together. Means also that brackets could be added this way if wished.