I'm not sure why you picked that unit to model. If you look at all the Army GP-10's on LocoPhotos, you'll see that one you picked is the only one with a GP-35 style cab. All the others have the more common rounded cab roof. It is a GP-35 style cab so a Cannon GP-3x cab would be a better replacement.
There is no Proto GP-18 in production. The Proto GP-18's all had high hoods and dynamic brakes. The only other company to produce a GP-18 was AHM, which has the high short hood but no dynamic brake. I would find one of those to use on a P2K frame since removing the dynamic brake is the hardest thing to get looking right. If you use a Proto hood, the best thing to to is use a Dremel tool to cut out the dynamic brake housing and replace it with scratchbuilt styrene to match the rest of the hood. This is not an easy task.
The filter was made by a company named Horst and is commonly known as an ox-yoke filter. This is a combination of an air intake and filter, built at the ICG's Paducah shops. The two units in your pictures have an additional filter added for use in sandy or dusty environments so you'd have to scratchbuild that and add it to a standard ox-yoke filter. You can get the standard Horst filter at http://www.walthers.com/exec/productinfo/229-2706.
As for the type of fan, most of the GP-10's have two 48" fans although there were several variations. It looks like the 4625 has a 48" fan at the rear but I can't tell what types of fans the 4624 has. Many GP-10's retained their standard 36" fans but had "liberated exhausts", with four large spark arresters on top of the long hood. I would guess that the two engines in your pictures have a pair of 48" fans since they have the later cab style.
Unless you're really in love with this particular model, it would be much easier to follow the ICG practice. Get an Atlas or Proto GP-9 and add the low short hood and modify it to represent a GP-10. You can get one without dynamic brakes and you would not have to modify the cab roof shape. You'd end up with one like the photo at http://www.locophotos.com/PhotoDetails.php?PhotoID=34143.
There is no Proto GP-18 in production. The Proto GP-18's all had high hoods and dynamic brakes. The only other company to produce a GP-18 was AHM, which has the high short hood but no dynamic brake. I would find one of those to use on a P2K frame since removing the dynamic brake is the hardest thing to get looking right. If you use a Proto hood, the best thing to to is use a Dremel tool to cut out the dynamic brake housing and replace it with scratchbuilt styrene to match the rest of the hood. This is not an easy task.
The filter was made by a company named Horst and is commonly known as an ox-yoke filter. This is a combination of an air intake and filter, built at the ICG's Paducah shops. The two units in your pictures have an additional filter added for use in sandy or dusty environments so you'd have to scratchbuild that and add it to a standard ox-yoke filter. You can get the standard Horst filter at http://www.walthers.com/exec/productinfo/229-2706.
As for the type of fan, most of the GP-10's have two 48" fans although there were several variations. It looks like the 4625 has a 48" fan at the rear but I can't tell what types of fans the 4624 has. Many GP-10's retained their standard 36" fans but had "liberated exhausts", with four large spark arresters on top of the long hood. I would guess that the two engines in your pictures have a pair of 48" fans since they have the later cab style.
Unless you're really in love with this particular model, it would be much easier to follow the ICG practice. Get an Atlas or Proto GP-9 and add the low short hood and modify it to represent a GP-10. You can get one without dynamic brakes and you would not have to modify the cab roof shape. You'd end up with one like the photo at http://www.locophotos.com/PhotoDetails.php?PhotoID=34143.
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