Hi there
not DIY, but done by an installer:
Huawei SUM2000-5KTL-M1 5.0Kw, 3 Phase inverter and totally 14 Jinko PV panels 470W, no battery as yet, cost was slightly below 200 KTHB all in.
Running with 0 export most of the time. It is still slightly hazy but we are getting close to 5 kW at the moment.
I would have to agree that 3 x 1-phase inverters might have been better due to 1 phase dropping out frequently. At the time of decision I did not think about this possibility but I guess it would have made the setup more expensive and complicated.