I have a late 2014 13" MacBook Pro with the following specs:
2.6 GHz Core i5 (4th Gen / Haswell)
16 GB 1600 MHz DDR3 RAM
Intel Iris 5100 integrated graphics
It runs SketchUp well and drives a Dell U3415W external monitor without any problems or latency. Given that the model you’re considering is two generations newer for both CPU and GPU, (with associated increases in speed/power) it should work really well. That model can drive a 5K monitor with a single TB3 cable.
If you’re planning on heavy-duty rendering, then it would be an issue: but even with my modest machine I have had good results using Twilight — just have to learn which settings prevent an overly-taxing render and not get overly-ambitious.
I wouldn’t worry about Intel integrated graphics compatibility at all – there have been associated issues reported with Windows PC’s but never heard any from recent MacBooks. (probably because they use the higher spec’d Iris graphics vs the lower-end HD graphics often found on PC ultrabooks - plus you don’t have wonky driver issues on the Mac)
There have been many reports of SU Pro 2016 compatibility issues with Sierra, but a recent SU update has addressed the worst bugs, and the immanent 2017 release should clear up the rest. (I’m still running SU Pro 2015 / El Capitan)
I love my MacBook, and I’m sure you’d find the newest model hits a great sweet spot for weight, power and portability (and fabulous screen)… though it sure is pricey!