Problems with a wide background - Metal Slug

I'm trying to do a replica of Metal Slug, and I'm having problem with the background.

The bg is too large and:

1) I can't see it entirely on Construct 2

2) On a mobile a sprite like that would be too heavy

3) Tha layout size can't be bigger than 6904 pixel

I tried to find something on the forum, but nothing seems to talk of it.

Sorry if it's a stupid question!

Thanks in advance

P.S.

Here is the .capx:

https://www.dropbox.com/s/55q6gypwnb25e ... .capx?dl=0

Our primary layout is 10,000 x 10,000 px, so #3 is definitely not true (it is not a single sprite though). As far as single image sprites, you might want to use a smaller image and use the tiled background?

I definitely think that some kind of tiled background is your best bet. You can always use other small sprites layered periodically on top to produce some variation in scenery, but the raw background needs to be tiled.