I designed this in Tinkercad so that i could move all my electronics to the base and have a cleaner setup. This is still a work in progress, it uses M3x4x4.6 heat inserts. floor plates will be uploaded later, they will be generic flat plates with screw holes at  the proper locations  so you can design your lay out as you like. it uses 120x25mm fans and has slots for filter screens in front of each fan, anchor holes to 3030 are m5. this is setup for my HEVO thats 420mm on X and 410mm on Y. it is designed this way to reliably print with supports on 285mm bed. once its completed i will include pic's. i printed with Zyltech PLA and 20% infill.