All the recipes I've seen online say to do it just before serving. But I am taking it as a pudding to a meal at MIL's house, and would really rather prepare it all at home before going there (other people's kitchens and all).
Will my mess be sodden and soggy if I put it all together about 3 hours before serving?
You can whip the cream, wash, hull and chop the strawberries and prepare the raspberry/strawberry sauce all before guests arrive if its a lunch/dinner you are doing.
I keep everything separate in the fridge and then do a party piece in front of guests by assembling it in tall glasses in front of them. Bit of grated chocolate on top and some Cherry Kirsch in the sauce is nice for adults.
So long as the wine is flowing and everyone is chatting its quite a nice thing to do without having to disappear.
A other say, meringes will go soggy and the cream curdle and the sauce leech all over into a pink soggy sloppy mess if you do it before.