Need help modeling a sheet metal fireplace hood

[Canisalpha]

I have modeled what will be a fireplace hood . Flue pipes will attach to the holes and the part will be mounted atop a firebrick masonry structure. I need to create a flat pattern so that this part can be plasma cut on a 2mm thick steel sheet and welded up. I would like a tutorial or sequence of steps to help me place rips on the 4 sloping edges and then create a flat pattern.  I tried doing that but then I can't place bends that allow me to flatten the part. Any help would be appreciated.

[Mark.Lancaster]

@Canisalpha 

When posting and sharing files make sure to always include Inventor version this file was last save with.  In you case its  Inventor 2020.2

[Canisalpha]

Sure. Thanks for the tip.

[JDMather · Accepted solution]

How many individual pieces do you want this to be?

1?

2?

3?

4?

5?

Fire Hood.png

See Attached file.

[Canisalpha]

Thank You. The flat pattern you have created is what I was trying to do.

This was my first time modeling with sheet metal . 
I hadn't realized that the corner tool could build up the sheet sections that way.