I can't even load the main game (GTX1080, 16GB, i7-3770K@4.4GHz, W10 64-bit) and I've tried with every major update (it's NOT my system). I did over a year ago, and I can run the smaller modules like the hangar and the obstacle course.
I got a rock-solid experience with the obstacle course and it looks great but when I could load the main game it was a massive STUTTER-FEST.
I have followed some of the progress though at the Star Citizen site. Enough to know that the minimum's are likely to be quite high across the board for GPU, CPU and system memory.
They are even experimenting with STREAMING textures (I.e. Intel Optane SSD streaming stored textures to VRAM) and a lot of stuff is just incredibly unoptimized so it's just impossible to be guess and expect to be very close to the final result.
My best guess for it going "GOLD" is still end of 2019 though even when it goes gold it will continue to be optimized.
This will never be a good experience in a lower-end system with an iGPU. Probably won't even start.