I have a 7.5m catamaran RIB, with a 120HP - Mercruiser 1.7DTI diesel engine, please have a look at my website www.lagaude-marine.com
The boat has a very few hours (10) she has been used for testing with customers and marine newspapers.
Incredibly stable (she is CE approved for 26 people) when we made the stability test there were 29 adult people on the side, and the pontoon was dry !
Fast, 33 knots with this small motor.
Presently she is fitted with a rear console for two, plus 2 front seats.
I have made a bolster seat for 2, attached to the right side of the console.
All fittings are to be made on customer order.
The same boat could get a more powerful motor, VW, Volvo, FNM ... preferably light, around 300kg is perfect.