Forgot to add in my last post, there's one other option I can think of for a decent-sized, low budget RC warship - the Lindberg 1/125 scale "Blue Devil" Fletcher-class destroyer. This is about £70 in the UK though you can sometimes find a cheaper second-hand example on eBay. It makes an approx. 3ft long model with twin props and rudders (replacement propshafts and motors are definitely recommended, the kit ones - if they're included - are cheap and flimsy) and the scale is large enough for plenty of detail without being too fragile.
However, unlike the Revell Corvette, which is lacking in fine detail but basically accurate, the Lindberg Fletcher is very crude and inaccurate - making a decent scale model out of one is a lot of work (I've tried myself!) But for a semi/standoff-scale R/C model, it's more than good enough. There are a few relatively easy + quick fixes that improve the appearance a lot, like lengthening the main gun barrels and replacing the (solid plastic) radar with metal mesh.
Regarding your question - Just about any plastic model boat/ship with a full hull (i.e not waterline like most 1/700 kits) can theoretically be converted to R/C, but the small scale and size of most kits introduces many problems, not least actually fitting R/C gear, battery and motors into them! 1/350 battleships and heavy cruisers are big enough, but fine details are very prone to getting damaged, and it's hard to get them running at anything resembling a scale speed; 1/72 MTBs/PT boats, lifeboats, tugs etc. are a big enough scale for fine detail like railings, but even the larger German Schnellboots are a bit marginal as regards hull size and weight. But there are numerous kits out there which are quite suitable for R/C, such as the Lindberg 1/72ish tug and trawler, Revell 1/72 German lifeboat "Hermann Marwede" and 1/144 Fletcher-class destroyer, and others. These might be a bit small for a first-time project though (the Fletcher is near 3ft, but quite narrow and shallow; the Lindberg one, as well as being a bigger scale, has a hull deeper than scale to make it more stable)
There are also two battleship kits in 1/200 scale - Trumpeter's USS Arizona and Nichimo's IJN Yamato - but both of these are well over £100 (£200-odd in the case of the Yamato!) just for the kit alone.
