so most of the spiders have fairly established recommended build at the moment, but there are some nice tricks to help you save C-Bills: Double heat sinks 5V and 5K are two of the few mechs that can survive on the field without DHS. with DHS you pretty much cannot over heat these mech, and with its still pretty tricky. - saving 3mil C-Bills Engine synergies STK-5S - stock XL255 can be used in Spiders All three mechs can run the same max engine making the XL255 a pretty good buy in itself, get one engine and swap it between the 3 chassis. There is an Almost synergy with the 2X and 4X ravens. Rather than the XL255 go for a XL245, one engine for 5 mechs? the speed loss isn't much and the ton saved can be used on an extra heatsink!