Luggage compartment dimensions Smart ForTwo Convertible

Hello together, we consider the purchase of a Smart ForTwo as a second car – likes to be a convertible CDi. And that’s exactly what I have a question for the professionals here in the forum: The trunk is of course not big – no question (can you call it that at all?). But how are the dimensions between Coupe and Cabrio, is the base area identical? Does anyone even have the exact dimensions? Do the famous two water boxes fit into the convertible case space? The volume of 150 l sc in both cases to be the same. Then maybe a few tips to a possible smart newcomer: I plan the purchase of a Smart ForTwo Convertible, gladly as CDi. The model year should be at least 2003 (wg. chassis, ESP, etc.), mileage max. 50,000 (offers per PN are welcome!). What else should one pay attention to? Thanks for your answers, tips and suggestions!