Have a 4.2m Stacer Seahorse and have always had problems placing things somewhere knowing it would be there affter a road trip or indead a fishing trip 

So when I had seen a BLACK plastic box with lid in a shop I had the idea it would be useful, only cause no-one could see inside it 
AND.... it would float if I was turned over etc 

My tinnie had no flat floor at the front, in front of the front bench (seat) so I made a sample from cardboard, so it would sit on the stringers and runners and be level.

I then transferred the sample to some 'marine' ply (look-alike) and it fitted nicely between the front seat and the tray under the front, as seen in the photo.

I put the box on the board and measured where the box had to sit, so it would not touch the front seat, then glued/screwed a piece of 3" x 2" timber across the board.

I then covered the ply platform and 3 x 2 in black boat carpet, to match the black plastic box. 
As in the photo it can't be seen from the back of the boat.

Now will glue a bit of black carpet to lid so the RED CLIPS are not seen and it looks like it's just 'rubbish' in the front of the boat.

 The black box IS sitting behind the front seat in this photo - is not seen unless you get up close and personal 

Black box sits nicely in the gap available with-out hitting front ( or back ) of the first seat.