Yes, I would like to travel on the 5BEL when it is all finished and allowed on the main line. I would also like to go on one of the Southern Region Main line older EMUs, I think there is one called "Gordon Pettit" ??. That has a connection with the Bluebell line and possible was last heard of in Ilford. There were a couple of 3 carriage slam door EMUs that were used on the shuttle service from Brockenhurst I think to Lymington for the Isle of Wight too.
(I seem to remember, when the old slam door EMUs were coming off the Kent services, there was a rail tour with 3 destinations/routes. 12 Carriages departed London, then when they got further down the line, possibly Ashford Kent, the train splint into 3 sections, with 3 different routes around Kent, before, I presume, joining up later in the day.)
I would also like to do a trip in the "Wessex Electrics" 442? which were on SWT then moved to Southern, then I think were due to go back to SWT/SWR, but with cv, I don't know if that ever happened.
I have been of several of the Hastings Diesels trips which are great, it's amazing how fast that can go when it gets a good clear path.