Honestly? To upgrade the spider to such an extent is hilariously expensive. (As in MIllions of C-bills and a few months in an on-planet repair facility)<br/><br/>However, IF it can be done, it would mean a 9/14/9 30-ton light with (personal reccomendation) 4 medium lasers. Flamers are hilariously useless against anything but civilians, or unarmoured infantry. (Note; Federated Suns, Capellan Confederation, Draconis Combie, and Free Worlds Leage are all known for using the Firestarter 'mech as an Anti-riot machine. The Lyran Commonwealth tends to use the Commando Loaded with Infernos)<br/><br/>Now, this upgrade does come with a MAJOR drawback; namely, the Spider will run red-hot. It only has 10 heat sinks, so if it alpha-strikes after a jump, It'll be eating 11 heat buildup after the 'sinks do their work. (Which, mechanically, means +1 penalty to accuracy, -2 penalty to walking speed, with attendant reduction in running speed) If you do consider upgrading that much, also consider the relative merit of upgrading to DHS and Ferro-Fibrous armour for added survivability.