I liked the idea of that wonder combo and decided to leave Deity masochism for a day and play IMM as egypt. I got all three wonders with ease.
I beelined construction, neglecting NC and even luxuries. I hard built the great wall. As for policies, I went tradition-aristrocracy-liberty-citinzenship-meritocracy. The free great engineer rushed the Castle. I tried to keep 3 RA`s going, but it was far from perfect, due to lack of gold (both me, sometimes, and the AI`s). The crucial techs out of RA`s were Civil Service, Currency and the Kremlin tech (acoustics?). I hard teched education and chivarly, which is not optimal.
I never managed to get workshops out before Kremlin to accelarate the second engineer. The points from Great Wall and the Castle did the job and he came out in time for another rush.
I ended up with the three wonders without ever feeling raced too close for any of them. I also squeezed a couple settlers in my build order so I have 3 solid cities and I could add another decent one if I want.
What I did neglect was my military. But I was playing my map. I DoF`ed one of two neighbours so I only had to care about the other one (England). I got two free units out of city states that I befriended for a short time after an automated scout cleaned two quest camps (?) (lucky me I guess, but it`s cool to know that they can do it anyways). I also planned to buy england into a war to keep them busy, but I did too late and they attacked me anyways. No problem. With the wonders up (kremlin just finishing) my minimum military easily dealt with the invaders.
I haven`t finished the game yet but I feel like I can turtle up to whatever victory condition I want.