Flexi FLOW Covered Hopper Kitbash hatches???

[ALCO1000]

To Modelers,
I have found an interesting project to make a respectable model of the early pressure flow hopper The Flexi Flow hopper ,there are articles

and kit bashes ot there turning the crude Roco AHM Model that is rare obscure and otherwise is only made in imported brass( Hint

Bachmann)! There are many parts and styrene to do this, but there are 3 hatches on the roof that I cannot seem to match up with anything

,almost looks like tank car hatch????Any advise would be appreciated,Thank you for any input.
Jack

[bapguy]

Does it look like this ?  Joe
http://shop.atlasrr.com/p-700-ho-23-500-tank-car-man-way-cover.aspx

[bapguy]

Or maybe these ?  Joe
http://shop.atlasrr.com/p-2690-ho-5701-ctrflw-hopper-cir-roof-hatches.aspx

[trainboy6936]

@ALCO1000.......do you have a photo of the hopper?

[ALCO1000]

http://i916.photobucket.com/albums/ad8/alco00011/flexiflowhoppercar_zps3770f0b5.jpg

[ALCO1000]

http://i916.photobucket.com/albums/ad8/alco00011/FLEXIFLWHOPPEROMI_zps6a812eb2.jpg

[ALCO1000]

http://i916.photobucket.com/albums/ad8/alco00011/flexiflowhoppercar_zps3770f0b5.jpg

photo of hopper and oops bonus rough layout diagram that may challenge the best of how to isolate it and install reverse loop modules kind of half way working ,problem being the overlap in a few places,I know it is not part of this discussion ,but we accidentally included the pictures,ANY input would be valued ,
Jack

[ALCO1000]

Does it look like this ?  Joe
http://shop.atlasrr.com/p-700-ho-23-500-tank-car-man-way-cover.aspx

Close Joe,,,,,, The OMI pic has raised caps that are hinged,The proto picture  has flat caps that are lower and smaller,from info I obtained the

modeler who kitbashed one step by step online made a very good step by step build and essay along with it ,but he said the caps that

have to be changed on the AHMmodel are 20 inches and look a little large ,From what he is saying there are changes through thought  its build life! I like the challenge to match details to the level of the OMI !IT sets the bar high ,even if you get it close your doing well,

[ALCO1000]

Does it look like this ?  Joe
http://shop.atlasrr.com/p-700-ho-23-500-tank-car-man-way-cover.aspx

NO, well being round is something ,the other is closer ,this is the hard part of the build for me,Thank a lot foe your efforts,  J ACK

[ALCO1000]

http://i916.photobucket.com/albums/ad8/alco00011/flexiflowhoppercar_zps3770f0b5.jpg

Picture of 1 variation of the flexi flow hopper this evolved into what we have today