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@Rik_Van_Looy
The key difference is that the road bike has 55cm ST & 56cm TT whereas this design is 58cm square...
I thought I'd best check the geo to ensure It's comfy/efficient by correlating empirical data (De Rosa) with theoretical data (Internet bike fit)...
If we subtract 17 cm crank length from the 95.6cm saddle-pedal distance (bike fit) the saddle sits 78.5 cm from the BB.
Assuming the same stem length/slammage on both, the measurement from the centre of saddle down to the top of the headset is nearly the same for the 58 square proposal as it is for the 55/56 road frame.
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