Ok when you are able the repair can be accomplished. At present you have a hull with a transom fully glued in place incorrectly. This is really the only part that need removing and is relatively accessible.
I would use a coping/razor saw to carefully cut thro the joint between the transom and the top deck. Leave the tabs in the top deck.
Then cut thro the joint between the servo tray and the transom. Ignore the tab. The round hole will now be open at the stern so you may need to temporally clamp a piece of wood 1/8"x1/4" underneath to support. I assume this is to give access to the rudder. When finally finished you may need to open the round hole to the original diameter with a round file.
Then cut off the join between the bottom stringers and the transom which can then be removed. You could cut round the join or cut flush and remove the stringer bits later.
Get some large rubber bands ( I get mine from discarded Postal services rubber bands) and put them round the hull fore, middle and back.
Insert the two side skins and align with the bow and hold in place with the bands (you may need to pin in places).
At the stern mark the edge of the skins with the bottom stringers and the servo tray.
Measure the thickness of the transom and use this to mark the correct position on the servo tray and cut using the outside (stern) of the marked line.
Try the transom for correct fit (top to bottom) and carefully sand (using a flat sander) until you are happy it aligns on both sides with the side skins.
Refit the transom to the underside of the deck and the bottom stringers. This will again require some careful sanding so take your time. It sometimes helps to take a break at this point and return refreshed before proceeding.
When happy glue the transom back in place. When set cut the stringers flush with the transom and sand smooth
To support the servo tray I would use a small fillet 1/8"x1/8" of wood underneath the tray, attached and glued in place.
You could order new parts but that will require much more work to remove the parts already glued in place and once built there will be no evidence of the repair I am suggesting.
Hope this helps for when you are able to proceed
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