It's hard to offer an opinion not having seen the car but as long as the repairs have been done to a decent standard I could live without the jacking points - I would never use them anyway! The key to the whole thing is structural integrity. If the sills have been patches, filled and generally tarted up to look good then unless the rest of the car is excellent I'd be very careful. Sill replacement on these cars is a bit of a big job as you have to unpick the join at the front wing - there are a few rust traps involved which means it could uncover more rot
Never was the rule more apt "Buy bodywork" - the 200 mechanicals are pretty tough and more importantly common - the 6 pot is, in various configurations, in lots of Triumphs -TR6, GT6, Vitesse, Mk2 and Mk1 2000 etc. Whilst the 2000 may be undervalued, the TR6 isn't - so you have got lots of mechanicals to choose from.
A few pictures would help greatly.



