Has anyone here ever done a DIY deck extension? If so, I'd love to see some pics/ideas. I'd like to build an extension to bring this front deck all the way back to the console. Ideally, I'd like it to be removable, not permanent, because there are times the extra floor space is nice.

Tiny boat nation, fireant fishing, and Anthony Jones on Youtube have some videos that could be helpful. Aluminum angle, pop rivets and decking with some bracket to hold/support on the existing deck should get you there.

Build it out of treated wood put some carpet to match and leave it as open as possible underneath.

Keeping it very simple is going to be your better option IMO. Match the carpet and it will look good and wood will be easy to work with. If it gets old and needs to be replaced that will also be easy.

Pretty easy. Depending on what boat it is, several companies have an aftermarket extension already made up. All you do is install. The ones I’ve installed were T60 aluminum wrapped in matching carpet, install with brackets that are bolted to the fiberglass.

It's a 1990 Venture Tournament....I'd love to find one pre-made for it as long as it's not stupid expensive.

Try metalmoulding.com. If they don’t have one made, they may can build you one.

Tiny boat Nation