The first stage is to figure out how much space you have. I would suggest that the minimum size for a decent training woody would be 3.6m x 2.4m (ie 3 sheets of ply) on an angle of around 30 degrees. If you have more space you can definitely aim to fit in as much as humanly possible. The more variety of angles the better, but note that you will not get a very good workout from a vertical wall. The best training angles are between 10 - 45 degrees. Roofs are fun to play on but are not great for training.
You can also add custom woody features such as these to your design:
Draw up a design and, if the space is tight, use string lines before you start building to maximise the space you’ve got.
Here is a list of the materials you will likely need:
Without going into massive detail as everyone builds framing differently you want to follow these guidelines:
Depending on your situation it may now be easier to secure the frames to the wall with struts etc, or you may want to leave them on the ground and put the panels on them after you have done the next step. It really depends on the situation but it can be very hard to hold a plywood panel in place on a steep angle whilst trying to secure it to the frame. If you're securing it to a brick wall be careful that the load you create isn’t going to tear a brick out of the wall. Use 10mm Dynabolts in masonry or 3/8th bolts if fastening to timber.
Whatever you do resist the temptation to texture the panels. There really isn’t any need to paint them either unless they are outside in the elements. If you texture the panels you will just waste your money resoling your shoes and non textured panels make it harder to smear so you’ll get stronger. Prepare the panels as follows BEFORE YOU SCREW THE PANELS ON THE FRAME:
Now that your panels are all nicely T nutted you can screw them onto your frames which are either on the ground or secured in place. Make sure you put a lot of screws into each panel, at least 20 should keep it nice and secure. Screw around the outside of the panels then move into the middle.
Hopefully by now you have a woody in place. If not, go back over one of the points just described. Getting your holds and putting them on is the fun bit!
The holds you get will obviously depend on a number of things. The angle of the wall, type of holds you like, your budget etc. Its best to get a variety of styles of holds. If you want to save some dosh make your own out of wood. You will need quite a lot of holds (depending on the size of your board) so a good way to start with plastic holds is to buy a value set. These generally give you a good variety of shapes at a good price per hold. you can then fill out the woody with other more specific holds once you know what you want. Also get some screw on holds as these will fit where you can’t get t nuts (on lips of roofs or corners and arêtes) and give your woody an extra dimension.
When you first put the holds on the board it can be easiest to put them on semi randomly. Start climbing on it and you’ll soon see where you want the holds to go.