Ladders are granny grating and those little spacer rings that come with my el cheapo tubes of superglue.
Blips are sewing pins pushed through a disk of magnetic paper and snipped off.
Fire markers are basically made completely out of hotglue using DmScotty's method.
And a little story for your enjoyment
Two troopers are sent out to investigate some ghostly blips on the scanners...
OH DROKK!!! We've got bugs!!!
Nuke'm from beond the airlock, its the only way to be sure.
Well thats all I got for you for now.