I would not expect any great difference in finished cost between the GT-40 or the SL-C.
I do believe that the GT-40 build time may be slightly greater because of the different style of bodywork. This is merely an assumption on my part not having built a 40. I do know how long it would take to build the SL-C, having assembled mine twice already (final assembly to come shortly). First time is around 200-250 hours maximum, assuming no significant changes are made. Just ask Rob Mesa (and me).
I do believe that the GT-40 build time may be slightly greater because of the different style of bodywork. This is merely an assumption on my part not having built a 40. I do know how long it would take to build the SL-C, having assembled mine twice already (final assembly to come shortly). First time is around 200-250 hours maximum, assuming no significant changes are made. Just ask Rob Mesa (and me).