This is my take on a Cooling solution for Pistorm32Lite for Amiga 1200. I wanted to do something different so you do not need to desolder USB/Ethernet from the PI and fit a fan behind in the lid. I also wanted the airflow to come from outside the case.

Update: Added my adapter for the Adjustable 3A MP1584EN DC-DC Converter Step Down Voltage Regulator Module. This is perfect for regulating the fan. Note that you should get 12 v to feed the MP1584 even for a 5 volt fan (test output before plugging the Fan). The adapter slides on the edge of the bottom bay, and the adjustment screw is pointing downwards to be reachable from the bottom of the Amiga 1200. I have solderen on two male Dupont to fit the JST XH 2.0 (thats usually the plug for the fan).

MP1584: https://www.aliexpress.com/item/4000016331112.html

For my setup I use a RaspBerry4 and not overclocked it runs stable at 50 Celcius which is within good limits (not recommended over 70 Celcius).

You will need a 5v 30x10mm cooling fan - typically the one that comes in coolant kits for Raspberry 3/4 or found here https://shorturl.at/gyzE1

You also need some tiny wood screws for the assembly. I used 2,5x8mm and longer 2,5x16 mm (?) through the fan housing.

For installation i recommend to assemble the whole setup before mounting into the Amiga. There is a lip on the bottom part that needs to be put under the mainboard PCB and then a screw on the right side.
You might want to temporary remove the floppy cable so you get some room while mounting.

I have a 1200 mainboard revision 2b, so pay attention if this fits your 1200.

The bottom has two options:
1a - Bottom: The one pictured and tested working.
1b - Bottom: One that has a buldge to make room for the RaspBerry 4 Micro HDMI inner cable. I have not tested it.

If you have feedback head over to DisCord and try to get hold of .Btty on https://discordapp.com/channels/784428461330530305/1082578009468457002