Hello Marco
Not tried the Modwright Transporter but I have had a standard and reference modified Transporter running with a DAS-R1 and the sound is sublime. The upgrades made to the Transporter are digital only, although the clock system sits central more or less to both digital & analogue.
I spent two months with the modded Transporter + DAS-R1 and took the CDP-R1 transport out of the system, that goes some way to telling you how good streaming music files is with this slick box.
All the best,
Mark