[quote=@Jig] Heh, you've really spotted my weakness in NRP's: this kind of technical, non-political history is something I just really don't have. I'm kind of aware that 'making sense' is great, but part of me has the attitude of 'this is fiction' - particularly given the maximum that sufficiently advanced tech is indistinguishable from magic, and this is hand-me-down sci-fi from the nation's forefathers (ie: a pre-war find. Maybe you missed that?). Sure, in the real-world, blowing up a warship just isn't really a thing with a tank, and I take that as read - but this isn't the real world. The reason I'd like it to be a stupidly oversized vehicle is because it's stranded on an island, both nerfing itself and seeming faintly ridiculous at the same time, while also guarding the vulnerable island at least by discouraging people from trying it on. If it was itself replaced by a warship, that's something that could actually have a practical offensive function, which isn't what I'm going for here. Meanwhile, if it was simply a big fuckoff cannon, somehow it loses something of the compensating-for-something vibe that I feel that a comically oversized vehicle that is also an archaeological heirloom has. I'm reminded of the battleships that the UK has in the Thames; there was a headline a few years ago about how a boat in London could hit something in the North of the country, if it so chose. I feel like this might be the key line, assuming anything quite so powerful isn't off the cards by virtue of being OP: the reason it's impractical is because it's so unlikely to hit. But if it [i]does[/i] land a hit, it's gonna sink something. Awesome. I'll peruse your sheet as I write mine and double-check certain things with you. [/quote] I said that a huge vehicle mounting an oversized cannon is unlikely but I also gave you two distinct ways to make it work. P1500 is basically a vehicle mounting the 800mm Schwere Gustav railway cannon. It's pretty much the largest gun ever made. With some automatization and design not sparing the cost you can turn it into a decent albeit prohibitively expensive naval defense platform. If you use sabot shells with rocket assisted or base bleed projectile then I can see you increasing the range even up to 100km. Sabots also have the benefit of being lighter thus perhaps further improving the rate of fire (once a minute sounds fine to me). Another option is that you literally dug up a damaged and mostly degraded BOLO, a futuristic tank from thousands of years ago. You couldn't save most of the systems but the AI is (barely) alive and the main cannon is very much operational thus you reconstruct the vehicle and then use it as tourist attraction while also acting as defense. Having an ancestral weapon with a quirky personality could be fun.