Help with Operation Stilleto, Act 5 Nod Options

[Kurorahk]

Okay this mission I am having difficulty with capturing both GDI Construction Yards and keeping the Nod base safe.

-Kurorahk

[Clazzy]

I did this mission as follows:
Send Shadows to the bottom base and clear out the Watchtowers and GDI infantry (it's possible to do this without losing a single one), then send all the engineers into the base along with the commando. Capture the refinery, the CY, a power plant and a barracks and churn out engineers to capture the rest of the base. Start building your base (best to get Sonic Towers ASAP because you won't be attacked by GDI a great deal) and get Mammoth tanks. If you're lucky, the Scrin won't reach the top base (and provided they stay online they shouldn't by the time you get there. Send the mammoths up to the top base hugging the far left, only attacking the defences at this entrance (leave the others, they'll slow down the Scrin). Once you're there, send the engineers in to capture the CY and build lots of Sonic Towers around it. Taking out the Scrin base from here should be quite simple.

Oh, and the Nod base is unimportant. It's good to keep it alive since it provides so much power but once the first GDI base is under your control don't pay too much attention to it, the AI don't.